How may you Explain the role of sensory and motor neurones in a reflex arc.?

How may you Explain the role of sensory and motor neurones in a reflex arc.?
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what is the role of sensory and motor neurones in a reflexarc
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Which controls reflex action? Options: A) Sympathetic nervous system B) Central nervous system C) Parasympathetic nervous system D) Sensory nerves

Description : Which controls reflex action? Options: A) Sympathetic nervous system B) Central nervous system C) Parasympathetic nervous system D) Sensory nerves

Last Answer : C) Parasympathetic nervous system

What happens in a reflex arc? -Biology

Description : What happens in a reflex arc? -Biology

Last Answer : answer:

What are the components of a reflex arc? -Biology

Description : What are the components of a reflex arc? -Biology

Last Answer : answer:

What is monosynaptic reflex arc? -Biology

Description : What is monosynaptic reflex arc? -Biology

Last Answer : answer:

Mention the parts of a reflex arc.

Description : Mention the parts of a reflex arc.

Last Answer : The five distinct parts of a reflex arc are: a) A receptor to receive stimulus (sense organs) b) Sensory neurons to conduct the impulses from receptors to the spinal cord or the hind brain. c) ... pass the impulse to an effector. e) An effector to take necessary action in response to the stimulus.

What is reflex arc?

Description : What is reflex arc?

Last Answer : The pathway of the nerve impulse involved in reflex action is called reflex-arc.

Reflex arc is made up of a chain of at least a. two neuron b. three neurons c. four neurons d. five neurons

Description : Reflex arc is made up of a chain of at least a. two neuron b. three neurons c. four neurons d. five neurons

Last Answer : two neuron

Define Reflex arc.

Description : Define Reflex arc. 

Last Answer : The inter neuron transmit the impulse to motor neuron. They carried the impulse to muscles. The pathway of nerve impulse that complete a reflex action is called reflex arc. It consists of receptor, a sensory neuron, an inter neuron, a motor neuron and effectors.

Motor starter or controller contacts may become welded together if the contacts _____________. A. open too quickly and arc B. close under excessive pressure C. open or close too quickly D. close under excessive starting current

Description : Motor starter or controller contacts may become welded together if the contacts _____________. A. open too quickly and arc B. close under excessive pressure C. open or close too quickly D. close under excessive starting current

Last Answer : Answer: D

Motor controller or starter contacts may become pitted and welded together if the contacts _____________. A. open under loaded conditions B. close slowly with light pressure C. open too quickly and arc D. close quickly with proportionate pressure

Description : Motor controller or starter contacts may become pitted and welded together if the contacts _____________. A. open under loaded conditions B. close slowly with light pressure C. open too quickly and arc D. close quickly with proportionate pressure

Last Answer : Answer: B

What is the difference between a sensory and a motor neuron?

Description : What is the difference between a sensory and a motor neuron?

Last Answer : A: Sensory neurons transmit information from sensory organs to the central nervous system, while motor neurons transmit information from the central nervous system to muscles and glands.

What is the difference between a sensory neuron and a motor neuron?

Description : What is the difference between a sensory neuron and a motor neuron?

Last Answer : A: Sensory neurons transmit information from sensory receptors to the central nervous system, while motor neurons transmit information from the central nervous system to muscles or glands.

Major cordinating centre of fore brain which is wrapped around by cerebrum and responsible for motor & sensory signalingg is

Description : Major cordinating centre of fore brain which is wrapped around by cerebrum and responsible for motor & sensory signalingg is

Last Answer : Major cordinating centre of fore brain which is wrapped around by cerebrum and responsible for motor & sensory signalingg is

Region of cerebral cortex which is neither motor nor sensory is

Description : Region of cerebral cortex which is neither motor nor sensory is

Last Answer : Region of cerebral cortex which is neither motor nor sensory is

Major cordinating centre of fore brain which is wrapped around by cerebrum and responsible for motor & sensory signalingg is

Description : Major cordinating centre of fore brain which is wrapped around by cerebrum and responsible for motor & sensory signalingg is

Last Answer : Major cordinating centre of fore brain which is wrapped around by cerebrum and responsible for motor & sensory signalingg is

Region of cerebral cortex which is neither motor nor sensory is

Description : Region of cerebral cortex which is neither motor nor sensory is

Last Answer : Region of cerebral cortex which is neither motor nor sensory is

Can a nerve fibre and nerve both carry sensory and motor impulses?

Description : Can a nerve fibre and nerve both carry sensory and motor impulses?

Last Answer : There are the Mixed Nerves in the spinal column that carry bothsensory and motor nerves, but these neurons have 2 different jobsthat they do,& I know of no neurons doing both as the impulsestravel to 2 different locations which couldn't be done at the sametime.

In injury of the peripheral nerve: a. pure sensory or pure motor nerve tends to regenerate better than mixed nerve b. in neuropraxia, there is anatomical disruption of the nerve c. Wallerian degeneration occurs 3 days after the injury d. Wallerian degeneration occurs proximal to the site of the injury

Description : In injury of the peripheral nerve: a. pure sensory or pure motor nerve tends to regenerate better than mixed nerve b. in neuropraxia, there is anatomical disruption of the nerve c. Wallerian ... occurs 3 days after the injury d. Wallerian degeneration occurs proximal to the site of the injury

Last Answer : pure sensory or pure motor nerve tends to regenerate better than mixed nerve

In injury of the peripheral nerve: a. pure sensory or pure motor nerve tends to regenerate better than mixed nerve b. in neuropraxia, there is anatomical disruption of the nerve c. Wallerian degeneration occurs 3 days after the injury d. Wallerian degeneration occurs proximal to the site of the injury

Description : In injury of the peripheral nerve: a. pure sensory or pure motor nerve tends to regenerate better than mixed nerve b. in neuropraxia, there is anatomical disruption of the nerve c. Wallerian ... occurs 3 days after the injury d. Wallerian degeneration occurs proximal to the site of the injury

Last Answer : pure sensory or pure motor nerve tends to regenerate better than mixed nerve

The ciliary ganglion: a. is found between the optic nerve and the medial rectus b. contains sympathetic nerve that supplies the sphincter pupillae c. is a parasympathetic relay ganglion for fibers from the Edinger-Westphal nucleus d. contains sensory nerve e. has a motor nerve that goes to the inferior oblique

Description : The ciliary ganglion: a. is found between the optic nerve and the medial rectus b. contains sympathetic nerve that supplies the sphincter pupillae c. is a parasympathetic relay ganglion for fibers from ... nucleus d. contains sensory nerve e. has a motor nerve that goes to the inferior oblique

Last Answer : is a parasympathetic relay ganglion for fibers from the Edinger-Westphal nucleus

Destruction of the anterior horn cells of the spinal cord would result in loss of (a) commissural impulses (b) integrating impulses (c) sensory impulses (d) voluntary motor impulses

Description : Destruction of the anterior horn cells of the spinal cord would result in loss of (a) commissural impulses (b) integrating impulses (c) sensory impulses (d) voluntary motor impulses

Last Answer : (d) voluntary motor impulses.

Which nerve is assessed when the nurse asks the patient to dorsiflex the ankle and extend the toes? a) Peroneal The motor function of the peroneal nerve is assessed by asking the patient to dorsiflex the ankle and extend the toes while the sensory function is assessed by pricking the skin between the great and center toes. b) Radial The radial nerve is assessed by asking the patient to stretch out the thumb, then the wrist, and then the fingers at the metacarpal joints. c) Median The median nerve is assessed by asking the patient to touch the thumb to the little finger. d) Ulnar Asking the patient to spread all fingers allows the nurse to assess motor function affected by ulnar innervation.

Description : Which nerve is assessed when the nurse asks the patient to dorsiflex the ankle and extend the toes? a) Peroneal The motor function of the peroneal nerve is assessed by asking the patient to ... the patient to spread all fingers allows the nurse to assess motor function affected by ulnar innervation.

Last Answer : a) Peroneal The motor function of the peroneal nerve is assessed by asking the patient to dorsiflex the ankle and extend the toes while the sensory function is assessed by pricking the skin between the great and center toes.

Which nerve is assessed when the nurse asks the patient to spread all fingers? a) Ulnar Asking the patient to spread all fingers allows the nurse to assess motor function affected by ulnar innervation while pricking the fat pad at the top of the small finger allows assessment of the sensory function affected by the ulnar nerve. b) Peroneal The peroneal nerve is assessed by asking the patient to dorsiflex the ankle and extend the toes. c) Radial The radial nerve is assessed by asking the patient to stretch out the thumb, then the wrist, and then the fingers at the metacarpal joints. d) Median The median nerve is assessed by asking the patient to touch the thumb to the little finger.

Description : Which nerve is assessed when the nurse asks the patient to spread all fingers? a) Ulnar Asking the patient to spread all fingers allows the nurse to assess motor function affected by ulnar innervation ... The median nerve is assessed by asking the patient to touch the thumb to the little finger.

Last Answer : a) Ulnar Asking the patient to spread all fingers allows the nurse to assess motor function affected by ulnar innervation while pricking the fat pad at the top of the small finger allows assessment of the sensory function affected by the ulnar nerve.

Epidural anaesthesia differs from spinal anaesthesia in that: A. Epidural anaesthesia produces less cardiovascular complications B. Headache is more common after epidural anaesthesia C. Blood concentrations of the local anaesthetic are lower after epidural anaesthesia D. Greater separation between sensory and motor blockade can be obtained with epidural anaesthes

Description : Epidural anaesthesia differs from spinal anaesthesia in that: A. Epidural anaesthesia produces less cardiovascular complications B. Headache is more common after epidural anaesthesia C. Blood ... . Greater separation between sensory and motor blockade can be obtained with epidural anaesthes

Last Answer : D. Greater separation between sensory and motor blockade can be obtained with epidural anaesthesia

In spinal anaesthesia the segmental level of: A. Sympathetic block is lower than the sensory block B. Sympathetic block is higher than the sensory block C. Motor block is higher than the sensory block D. Sympathetic, motor and sensory block has the same level

Description : In spinal anaesthesia the segmental level of: A. Sympathetic block is lower than the sensory block B. Sympathetic block is higher than the sensory block C. Motor block is higher than the sensory block D. Sympathetic, motor and sensory block has the same level

Last Answer : B. Sympathetic block is higher than the sensory block

Which of the following is not the reason for greater susceptibility of smaller sensory fibres to blockade by local anaesthetics than larger motor fibres: A. Sensory fibres are inherently more sensitive than motor fibres B. More slender fibres have shorter internodal distances C. Small sensory fibres generate higher frequency longer lasting action potential D. Smaller fibres have shorter critical lengths for blockade

Description : Which of the following is not the reason for greater susceptibility of smaller sensory fibres to blockade by local anaesthetics than larger motor fibres: A. Sensory fibres are inherently ... higher frequency longer lasting action potential D. Smaller fibres have shorter critical lengths for blockade

Last Answer : A. Sensory fibres are inherently more sensitive than motor fibres

Sensitivity of a nerve fibre to blockade by lignocaine depends on: A. Whether the fibre is sensory or motor B. Whether the fibre is myelinated or nonmyelinated C. Internodal distances in the fibre D. Both ‘B’ and ‘C’ are correct

Description : Sensitivity of a nerve fibre to blockade by lignocaine depends on: A. Whether the fibre is sensory or motor B. Whether the fibre is myelinated or nonmyelinated C. Internodal distances in the fibre D. Both ‘B’ and ‘C’ are correct

Last Answer : D. Both ‘B’ and ‘C’ are correct

Which of the following is NOT a type of neuron? a) sensory b) motor c) association d) stimulatory

Description : Which of the following is NOT a type of neuron? a) sensory b) motor c) association d) stimulatory

Last Answer : ANSWER: D -- STIMULATORY

What is the role of the brain in reflex action ? -Biology-10

Description : What is the role of the brain in reflex action ? -Biology-10

Last Answer : There is no role of brain in reflex action. These involuntary actions are controlled by the spinal cord which take place immediately without thinking of how to respond to the stimuli.

The following are true about the autonomic nervous system: a. the preganglionic fibres are mainly myelinated, slow conducting B fibres b. the postganglionic fibres are mainly unmyelinated C fibres c. all preganglionic neurones are cholinergic neurons d. all above

Description : The following are true about the autonomic nervous system: a. the preganglionic fibres are mainly myelinated, slow conducting B fibres b. the postganglionic fibres are mainly unmyelinated C fibres c. all preganglionic neurones are cholinergic neurons d. all above

Last Answer : all above

The following are true about acetylcholine: a. it is synthesized from acetyl-coenzyme A and choline b. its formation is catalysed by acetylcholinesterase c. at the synaptic cleft, it is inactivated by hydrolysis d. reuptake by the presynaptic neurones play an important in inactivating acetylcholine

Description : The following are true about acetylcholine: a. it is synthesized from acetyl-coenzyme A and choline b. its formation is catalysed by acetylcholinesterase c. at the synaptic cleft, ... inactivated by hydrolysis d. reuptake by the presynaptic neurones play an important in inactivating acetylcholine

Last Answer : at the synaptic cleft, it is inactivated by hydrolysis

The lateral spinothalamic tract: a. carries fibres which terminate in the thalamus b. contains mainly the second-order neurones. c. carries fibres that carry information on temperature and pain d. all above

Description : The lateral spinothalamic tract: a. carries fibres which terminate in the thalamus b. contains mainly the second-order neurones. c. carries fibres that carry information on temperature and pain d. all above

Last Answer : all above

In the neurones: a. the axons convey impulse away from the cell body b. neurotransmitters are synthesized in the cell bodies and then transported to the axons c. the condition velocity increases with fibre diameter d. the excitability is increased if the extracellular calcium concentration is decreased

Description : In the neurones: a. the axons convey impulse away from the cell body b. neurotransmitters are synthesized in the cell bodies and then transported to the axons c. the condition ... with fibre diameter d. the excitability is increased if the extracellular calcium concentration is decreased

Last Answer : the axons convey impulse away from the cell body

The following are true about the autonomic nervous system: a. the postganglionic neurones are largely unmyelinated b. all preganglionic neurones are cholinergic c. the preganglionic neurones of the sympathetic nervous system are shorter than the parasympathetic nervous system d. the parasympathetic outflow is only found in the cranial nerves

Description : The following are true about the autonomic nervous system: a. the postganglionic neurones are largely unmyelinated b. all preganglionic neurones are cholinergic c. the preganglionic neurones of ... parasympathetic nervous system d. the parasympathetic outflow is only found in the cranial nerves

Last Answer : the postganglionic neurones are largely unmyelinated

Choose the correct statement about lactulose: A. It stimulates myenteric neurones to enhance gut peristalsis B. Administered orally it acts as a purgative within 2-4 hours C. It is an osmotic laxative that produces soft but formed stools D. All of the above are correct

Description : Choose the correct statement about lactulose: A. It stimulates myenteric neurones to enhance gut peristalsis B. Administered orally it acts as a purgative within 2-4 hours C. It is an osmotic laxative that produces soft but formed stools D. All of the above are correct

Last Answer : C. It is an osmotic laxative that produces soft but formed stools

Select the prokinetic-antiemetic drug which at relatively higher doses blocks both dopamine D2 as well as 5-HT3 receptors and enhances acetylcholine release from myenteric neurones: A. Cisapride B. Prochlorperazine C. Metoclopramide D. Domperidon

Description : Select the prokinetic-antiemetic drug which at relatively higher doses blocks both dopamine D2 as well as 5-HT3 receptors and enhances acetylcholine release from myenteric neurones: A. Cisapride B. Prochlorperazine C. Metoclopramide D. Domperidon

Last Answer : C. Metoclopramide

Activation of the following type of receptors present on myenteric neurones by metoclopramide is primarily responsible for enhanced acetylcholine release improving gastric motility: A. Muscarinic M1 B. Serotonergic 5-HT3 C. Serotonergic 5-HT4 D. Dopaminergic D2

Description : Activation of the following type of receptors present on myenteric neurones by metoclopramide is primarily responsible for enhanced acetylcholine release improving gastric motility: A. Muscarinic M1 B. Serotonergic 5-HT3 C. Serotonergic 5-HT4 D. Dopaminergic D2

Last Answer : C. Serotonergic 5-HT4

The following antidepressant increases rather than inhibits 5-HT uptake into neurones: A. Clomipramine B. Fluoxetine C. Tianeptine D. Trazodone

Description : The following antidepressant increases rather than inhibits 5-HT uptake into neurones: A. Clomipramine B. Fluoxetine C. Tianeptine D. Trazodone

Last Answer : C. Tianeptine

Sodium valproate has been shown to: A. Prolong neuronal Na+ channel inactivation B. Attenuate ‘T’ type Ca2+ current in neurones C. Inhibit degradation of GABA by GABA-transaminase D. All of the above

Description : Sodium valproate has been shown to: A. Prolong neuronal Na+ channel inactivation B. Attenuate ‘T’ type Ca2+ current in neurones C. Inhibit degradation of GABA by GABA-transaminase D. All of the above

Last Answer : D. All of the above

The most probable mechanism of anticonvulsant action of phenytoin is: A. Facilitation of GABAergic inhibitory transmission B. Hyperpolarization of neurones C. Interaction with Ca2+ channels to promote Ca2+ influx D. Prolongation of voltage sensitive neuronal Na+ channel inactivation

Description : The most probable mechanism of anticonvulsant action of phenytoin is: A. Facilitation of GABAergic inhibitory transmission B. Hyperpolarization of neurones C. Interaction with Ca2+ channels to promote Ca2+ influx D. Prolongation of voltage sensitive neuronal Na+ channel inactivation

Last Answer : D. Prolongation of voltage sensitive neuronal Na+ channel inactivation

Select the correct statement about benzodiazepines (BZDs): A. All BZDs facilitate GABA mediated Cl¯ influx into neurones B. Different BZDs exert the same degrees of hypnotic, anxiolytic and anticonvulsant actions C. The BZD receptor is homogeneous at all neuronal sites D. The muscle relaxant action of BZDs is not blocked by flumazenil

Description : Select the correct statement about benzodiazepines (BZDs): A. All BZDs facilitate GABA mediated Cl¯ influx into neurones B. Different BZDs exert the same degrees of hypnotic, anxiolytic and anticonvulsant ... at all neuronal sites D. The muscle relaxant action of BZDs is not blocked by flumazenil

Last Answer : A. All BZDs facilitate GABA mediated Cl¯ influx into neurones

e primary mechanism by which general anaesthetics produce their action is: A. Affecting receptor operated ion channels in cerebral neurones B. Blocking voltage sensitive Na+ channels in neuronal membrane C. Depressing metabolic activity of cerebral neurones D. Blocking production of high energy phosphates in the brain

Description : e primary mechanism by which general anaesthetics produce their action is: A. Affecting receptor operated ion channels in cerebral neurones B. Blocking voltage sensitive Na+ channels in neuronal ... activity of cerebral neurones D. Blocking production of high energy phosphates in the brain

Last Answer : A. Affecting receptor operated ion channels in cerebral neurones

Choose the correct statement about sumatriptan: A. It activates serotonergic neurones in raphe nuclei B. It tends to suppress both pain and vomiting in migraine C. It does not carry risk of precipitating coronary vasospasm D. It is combined with ergotamine for treatment of severe migraine

Description : Choose the correct statement about sumatriptan: A. It activates serotonergic neurones in raphe nuclei B. It tends to suppress both pain and vomiting in migraine C. It does not carry risk of precipitating coronary vasospasm D. It is combined with ergotamine for treatment of severe migraine

Last Answer : B. It tends to suppress both pain and vomiting in migraine

The following serotonergic receptor functions primarily as an autoreceptor on neurones: A. 5-HT1A B. 5-HT2A C. 5-HT3 D. 5-HT4

Description : The following serotonergic receptor functions primarily as an autoreceptor on neurones: A. 5-HT1A B. 5-HT2A C. 5-HT3 D. 5-HT4

Last Answer : A. 5-HT1A

Which of the following terms refers to the inability to recognize objects through a particular sensory system? a) Agnosia Agnosia may be visual, auditory, or tactile.

Description : Which of the following terms refers to the inability to recognize objects through a particular sensory system? a) Agnosia Agnosia may be visual, auditory, or tactile. b) Dementia Dementia refers to ... d) Aphasia Aphasia refers to loss of the ability to express oneself or to understand language.

Last Answer : a) Agnosia Agnosia may be visual, auditory, or tactile.

Which of the following statements reflect current research regarding the utilization of non-pharmacological measures in the management of burn pain? a) Music therapy may provide reality orientation, distraction, and sensory stimulation. Researchers have found that music affects both the physiologic and psychological aspects of the pain experience. Music diverts the patient’s attention away from the painful stimulus. Music may also provide reality orientation, distraction, and sensory stimulation. It also allows for patient self-expression.

Description : Which of the following statements reflect current research regarding the utilization of non-pharmacological measures in the management of burn pain? a) Music therapy may provide reality orientation, distraction, ... of burn pain. Pet therapy has not proven effective in the management of burn pain.

Last Answer : a) Music therapy may provide reality orientation, distraction, and sensory stimulation. Researchers have found that music affects both the physiologic and psychological aspects of the pain experience ... orientation, distraction, and sensory stimulation. It also allows for patient self-expression.

Excessive heat in an operating motor controller can result from _____________. A. a closed starter contact B. loose connections C. missing arc chutes D. low motor starting torque

Description : Excessive heat in an operating motor controller can result from _____________. A. a closed starter contact B. loose connections C. missing arc chutes D. low motor starting torque

Last Answer : Answer: B

Later signs of increased intracranial pressure (ICP) later include which of the following? a) Projectile vomiting Projectile vomiting may occur with increased pressure on the reflex center in the medulla.

Description : Later signs of increased intracranial pressure (ICP) later include which of the following? a) Projectile vomiting Projectile vomiting may occur with increased pressure on the reflex center in the ... , the pulse pressure (the difference between the systolic and the diastolic pressure) widens.

Last Answer : a) Projectile vomiting Projectile vomiting may occur with increased pressure on the reflex center in the medulla.