Define reflex action.

Define reflex action.
by

1 Answer

Answer :

An immediate and involuntary response to a stimulus is called reflex action.

Quick pulling of hand just after touching the hot object is a common example of reflex action.

Explanation

When we touch hot object a nerve impulse is created in skin. It is carried by the sensory neuron to the spinal cord.

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.
by

Related questions

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.

Define diabetes

Description : Define diabetes 

Last Answer : Diabetes mellitus is disease in which sugar level increases in the blood.

Define Nerve.

Description : Define Nerve.

Last Answer : It is an enclosed, cable like bundle of axons present side by side in a common sheath. Nerve conveys messages carried by the individual neurons from one body part to another.

Define Dendrites.

Description : Define Dendrites.

Last Answer : A fine projection of the cell body that receives messages is called dendrites.

Define cell body.

Description : Define cell body.

Last Answer : The part of neuron containing nucleus and most of the cytoplasm is called cell body.

Define Nerve impulses

Description : Define Nerve impulses

Last Answer : Neurons carry messages in the form of electro-chemical waves called nerve impulses.

Define Neuron or Nerve Cell.

Description : Define Neuron or Nerve Cell.

Last Answer : Neuron or nerve cell is the basic structure and functional unit of the nervous system. All parts of the nervous system are made up of neurons.

Define nervous system

Description : Define nervous system

Last Answer : The organ system in our body that carries messages from one part of the body to another part and coordinates body functions is called nervous system.

How stones are formed in the kidney and how can these be removed?

Description : How stones are formed in the kidney and how can these be removed?

Last Answer : Sometimes kidneys cannot work properly to remove salt from blood. In such situation, the salts gather in kidneys and form stones. Stones can be removed in three ways I. By drinking water II. Lithotripsy III. shockwaves

Name any two waste materials produced by the human body

Description : Name any two waste materials produced by the human body

Last Answer : 1: Urine 2: Feces

What is kidney transplant?

Description : What is kidney transplant?

Last Answer : In this method a kidney donated by some healthy person is grafted in the body of the patient. The donar of kidney may be blood relative or any other close relative.

What is dialyzer?

Description : What is dialyzer?

Last Answer : Clearing of blood by artificial methods is called dialysis. It is done by a machine called dialyzer.

What is Hypertension?

Description : What is Hypertension?

Last Answer : It is a state of high blood pressure in the body. 

What is renal failure?

Description : What is renal failure?

Last Answer : It is a complete or partial failure of kidneys to work. The main cause of renal failure are I. long term infection II. Diabetes mellitus III. Hypertension

Describe structure of nephron

Description : Describe structure of nephron

Last Answer : It is the functional unit of kidneys. It consists of two main parts I. Renal corpuscle II. Renal tubule These are the tubules where urine is formed. There are over one million ... and is called Loop of Henle. The last part of the renal tubule is again coiled called distal tubule.

Write a note on internal structure of kidneys

Description : Write a note on internal structure of kidneys

Last Answer : Each kidney is divided into three regions 1. Renal cortex It is the outer most region of kidney 2. Renal medulla and renal pyramids Renal medulla is the middle regions which is divided into conical ... It is the inner area where urine is drained. The urine from renal pelvis moves into ureter.

Describe the main parts of excretory system in man.

Description : Describe the main parts of excretory system in man.

Last Answer : It consists of one pair of kidneys and associated structure. i.e. two ureter, a urinary bladder and urethra. 1. Kidneys Human body has two dark brown bean shaped kidneys in the abdominal ... A fine tube through which urine is released from urinary bladder to the outside is called urethra.

Describe peripheral nervous system (PNS).

Description : Describe peripheral nervous system (PNS).

Last Answer : PNS includes a network of nerves connecting the central system to whole body. The nerves which arise from brain are called cranial nerves. The nerves which arise from spinal cord are called spinal nerves. There are 12 pairs of cranial nerves and 31 pairs of spinal nerves in human body.

Explain central nervous system.

Description : Explain central nervous system.

Last Answer : CNS acts as a control Centre of the whole nervous system. It contains brain and spinal cord. Brain Human brain is enclosed in a bony skull called cranium. It divided into following ... between brain and different body parts. It also controls some reflex actions and some other involuntary actions.

Skin is considered as excretory organ. Why?

Description : Skin is considered as excretory organ. Why?

Last Answer : Because some extra salts are also removed through skin during perspiration.

Write the function of the followings 1. Forebrain 2. Hindbrain

Description : Write the function of the followings 1. Forebrain 2. Hindbrain

Last Answer : 1. Forebrain It is the largest part of the brain. It consists of three main parts I. Cerebrum II. Thalamus III. Hypothalamus Cerebrum is the topmost and the largest part of ... These are the tubules where urine is formed. There are over one million nephrons in each kidney. 

Write the names of main parts of the followings 1. Forebrain 2. Hindbrain

Description : Write the names of main parts of the followings 1. Forebrain 2. Hindbrain

Last Answer : 1. Forebrain It consists of three main parts I. Cerebrum II. Thalamus III. Hypothalamus 2. Hindbrain It consists of three main parts I. Cerebellum II. Pons III. Medulla oblongata 3. Neuron It ... Dendrites III. Axon 4. Nephron It consists of two main parts I. Renal corpuscle II. Renal tubule

How many types of neurons are there?

Description : How many types of neurons are there?

Last Answer : There are three types of neurons on the basis of functions. I. Sensory neurons II. Motor neurons III. Inter neurons 1. Sensory neurons It carries nerve impulses from sense organs (ears, eyes, skin, ... . 3. Inter neurons These are present in CNS. They form a link between sensory and motor neurons.

What is Axon?

Description : What is Axon?

Last Answer : A long projection of the cell body that conducts messages away from the cell body is called axon.

What is PNS?

Description : What is PNS?

Last Answer : PNS means peripheral nervous system that includes a network of nerves connecting the central system to whole body.

What is CNS?

Description : What is CNS?

Last Answer : CNS means central nervous system that includes brain and spinal cord.

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.

What is reflex action? -Biology

Description : What is reflex action? -Biology

Last Answer : answer:

Why does reflex action happen so fast ?

Description : Why does reflex action happen so fast ?

Last Answer : The sudden and automatic reaction of an event is called reflex action. The reflex is controlled by the spinal cord / spinal cord of the human body. Because it is located in the center of the body, it ... it takes more time. So the reflex action happens much faster than the reaction of the brain.

What is the acquired reflex action ?

Description : What is the acquired reflex action ?

Last Answer : The reflexes that are acquired through different experiences are called acquired reflexes. Such as- learning to walk , swimming.

What is innate reflex action ?

Description : What is innate reflex action ?

Last Answer : The reflexes that are inherited from the ancestor at birth are called innate reflexes. For example, if the hand is scorched, the hand is removed , if there is intense light in the eye, the eye is closed.

What is reflex action ?

Description : What is reflex action ?

Last Answer : The instantaneous , spontaneous, and involuntary response of a particular stimulus to an animal is called a reflex action .

How long does the battery last on the Norelco Speed XL Reflex Action 8240XL Rechargeable Cordless Shaver?

Description : How long does the battery last on the Norelco Speed XL Reflex Action 8240XL Rechargeable Cordless Shaver?

Last Answer : It is usually good for around 2 weeks with normal use and wear.

Does the Norelco HQ5 Replacement Head fit the Norelco Speed XL Reflex Action Rechargeable Cordless Shaver?

Description : Does the Norelco HQ5 Replacement Head fit the Norelco Speed XL Reflex Action Rechargeable Cordless Shaver?

Last Answer : All of the Speed XL Shavers uses HQ9 replacement heads.So you don't want the HQ5's

The path through which a stimulus passes in a reflex action?

Description : The path through which a stimulus passes in a reflex action?

Last Answer : Reflex arc

What is reflex action? Which is the centre of such action?

Description : What is reflex action? Which is the centre of such action?

Last Answer : Reflex action is an automatic response to an external stimulus. The centre of reflex action is spinal cord. The actions are independent of the brain. Ex: a) when we touch a hot object, we withdraw out hand b) When we step on a thorn unknowingly we withdraw our leg.

What is the rule of simple reflex agent? a) Simple-action rule b) Condition-action rule c) Simple & Condition-action rule d) None of the mentioned

Description : What is the rule of simple reflex agent? a) Simple-action rule b) Condition-action rule c) Simple & Condition-action rule d) None of the mentioned

Last Answer : b) Condition-action rule

The action of the Simple reflex agent completely depends upon __________ a) Perception history b) Current perception c) Learning theory d) Utility functions

Description : The action of the Simple reflex agent completely depends upon __________ a) Perception history b) Current perception c) Learning theory d) Utility functions

Last Answer : b) Current perception

The medulla oblongata contains reflex centers for control of a. heart action b. respiration c. vomiting d. all of them

Description : The medulla oblongata contains reflex centers for control of a. heart action b. respiration c. vomiting d. all of them

Last Answer : all of them

Which of the following statements is not correct? (a) An action potential in an axon does not move backward because the segment behind is in a refractory phase. (b) Depolarisation of hair cells of cochlea results in the opening of the mechanically gated potassium-ion channels. (c) Rods are very sensitive and contribute to daylight vision. (d) In the knee-jerk reflex, stimulus is the stretching of muscle and response is its contraction.

Description : Which of the following statements is not correct? (a) An action potential in an axon does not move backward because the segment behind is in a refractory phase. (b) Depolarisation of hair cells ... d) In the knee-jerk reflex, stimulus is the stretching of muscle and response is its contraction.

Last Answer : (c) Rods are very sensitive and contribute to daylight vision.

Which one of the following is the example of the action of the autonomous nervous system? (a) Swallowing of food (b) Pupillary reflex (c) Peristalsis of the intestine (d) Knee-jerk response

Description : Which one of the following is the example of the action of the autonomous nervous system? (a) Swallowing of food (b) Pupillary reflex (c) Peristalsis of the intestine (d) Knee-jerk response

Last Answer : c) Peristalsis of the intestine

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

Define Reflex actions?

Description : Define Reflex actions?

Last Answer : An Immediate and involuntary responses to a stimulus is called reflex actions 

What is that reflex that causes some people to be violent in the first second after they're awakened unexpectedly?

Description : What is that reflex that causes some people to be violent in the first second after they're awakened unexpectedly?

Last Answer : I think it is normal to react when somebody wakes you up unexpectedly. In nature you should protect yourself from somebody who wanted to attack you and this is the way you are protecting yourself when you are not conscious. Does that happen when the alarm clock is ringing?

What is that startle reflex that makes you jump or twitch awake?

Description : What is that startle reflex that makes you jump or twitch awake?

Last Answer : I think you're referring to the hypnic jerk reflex. This happens during the transition from wakefulness to sleep, aka hypnagogia. Since the a typical night's sleep cycles through around four ... wakefulness, there are several such transitions. The hypnic jerk reflex seems to be related to stress.

Why did the ears not develop a "blink" type reflex to guard themselves?

Description : Why did the ears not develop a "blink" type reflex to guard themselves?

Last Answer : answer:Evolution is imperfect. You can use your hands to cover your ears. There were fewer instances where man needed to protect his ears, but protecting our eyes happened daily just being in ... exposure. Most loud noises that cause hearing loss are man made, not naturally occuring. Just guessing.

Are there any Reflex Sympathetic Dystrophy support groups/charities in Atlanta?

Description : Are there any Reflex Sympathetic Dystrophy support groups/charities in Atlanta?

Last Answer : You might try checking here.

How to get past this weird gag reflex thing?

Description : How to get past this weird gag reflex thing?

Last Answer : Have you seen a doctor? A friend of mine has a throat problem. It closes, and they have to put a balloon in to expand it. It sou ds similar.

Can someone be hyptonized to no longer have a gag reflex?

Description : Can someone be hyptonized to no longer have a gag reflex?

Last Answer : First of all, the gag reflex is a defense mechanism. It keeps us from eating something based on signals from our sense that the thing is bad. We learn through time what is bad and we get ... completely, but you might be able to suppress a gag reflex that is based on memory and experience.

What are some ways of describing the process of shedding non-emotional or reflex tears without using the term crying, which generally refers to shedding emotional/psychological tears?

Description : What are some ways of describing the process of shedding non-emotional or reflex tears without using the term crying, which generally refers to shedding emotional/psychological tears?

Last Answer : You could call it crying, or if you don't like that it's already taken then try tearing , your welcome!