Description : Cells which envelop nerve fibres and form myelin sheath around the axon are
Last Answer : Cells which envelop nerve fibres and form myelin sheath around the axon are
Description : In Maize grain, plumule is covered by protective sheath called
Last Answer : In Maize grain, plumule is covered by protective sheath called A. Coeorhiza B. Coleoptile C. Tegmen D. Scutellum
Description : When a bare thermocouple is covered by a protective sheath, the response becomes (A) Faster and oscillatory (B) Faster and non-oscillatory (C) Slower and oscillatory (D) Slower and non-oscillatory
Last Answer : (D) Slower and non-oscillatory
Description : The parotid gland: a. contains a fascial sheath which is innervated by second cervical nerve b. receives post-ganglionic parasympathetic nerve from the otic ganglion c. contains a duct which opens ... . is composed of serous acini which contribute to the saliva e. is covered by the massenter
Last Answer : contains a fascial sheath which is innervated by second cervical nerve
Description : Which of the following statement is correct for node of Ranvier of nerve? (a) Neurilemma is discontinuous. (b) Myelin sheath is discontinuous. (c) Both neurilemma and myelin sheath are discontinuous. (d) Covered by myelin sheath.
Last Answer : (b) Myelin sheath is discontinuous.
Description : The pyrenoids are made up of (a) proteinaceous centre and starchy sheath (b) core of nucleic acid surrounded by protein sheath (c) core of protein surrounded by fatty sheath (d) core of starch surrounded by sheath of protein.
Last Answer : a) proteinaceous centre and starchy sheath
Description : The axon ends in a bunch of branches called
Last Answer : telodendrons.
Description : When the electric impulse travels along the axon and reaches the other end called the synaptic terminal, this impulse triggers the release of – (1) Vesicles (2) Cleft (3) Mitochondria (4) All of the above
Last Answer : (1) Vesicles Explanation: The electrical impulses stimulate the release of vesicles. These store various neurotransmitters that are released at the synapse. Vesicles are essential for propagating nerve impulses between neurons and are constantly recreated by the cell.
Description : (4) Fundamental unit of nervous system Explanation: A neuron is a cell that carries electrical impulses. Neurons are the basic units of the nervous system and its most important part is the brain. Every neuron is made of a cell body (also called a soma), dendrites and an axon.
Last Answer : Water cycle refers to - (1) an integrated attempt to recycle water in relatively arid regions (2) constant movement of water from ocean to land and back to ocean once again (3) ... management of water in areas excessively plagued with water-logging (4) water distribution in relatively dry area
Description : The junction between the axon of one neuron and the dendrite of the next is called (a) constant bridge (b) junction point (c) a joint (d) a synapse.
Last Answer : d) a synapse.
Description : The synaptic knobs represent the terminal endings of (a) the neuron (b) the dendron (c) the axon (d) the telodendria
Last Answer : Ans:(d)
Description : What is axon?
Last Answer : An axon is a single long, cylindrical fibre extending from a cell body
Description : Label te parts in the given diagram of axon terminal and synapse
Last Answer : Label te parts in the given diagram of axon terminal and synapse
Description : Type of synapse in which transmission of impulse across neuron is similar to conduction along a single axon
Last Answer : Type of synapse in which transmission of impulse across neuron is similar to conduction along a single axon
Description : What is the functions of the neuron's axon?
Last Answer : the function of the neuron's axon is to carry messages to othercells
Description : When an impulse reach the end of the axon the axon releases?
Last Answer : Neurotransmitters to the synapse and the neurotransmitters bindwith the receptors releasing the second messengers.
Description : At rest, the interior of the typical mammalian neuronal axon potential is approximately ________ mV (a) 0 (b) –70 (c) –100 (d) –20
Last Answer : Ans: B
Description : The filtration unit of kidney is - (1) axon (2) nephron (3) neuron (4) yellow fiber
Last Answer : (2) nephron Explanation: Nephron is the basic structural and functional unit of the kidney. Its chief function is to regulate the concentration of water and soluble substances like sodium salts by filtering the blood, reabsorbing what is needed and excreting the rest as urine.
Description : The conduction velocity of the nerve fibres is increased by: a. decreased temperature b. increased concentration of the external sodium ions e. increased axon diameter d. myelination
Last Answer : myelination
Description : A squid axon is placed on stimulating electrodes, and an intracellular electrode is inserted and connected through a cathode-ray oscilloscope (CRO) to an indifferent electrode. When the axon is stimulated, the latent ... . 40 m/s d. 67.5 m/s e. This cannot be determined from the information given
Last Answer : 30 m/s
Description : The action potential of a neuron a. is initiated by efflux of Na+ b. is terminated by efflux of K+ c. declines in amplitude as it moves along the axon d. results in a transient reversal of the ... the cell membrane e. is not associated with any net movement of Na+ or K+ across the cell membrane
Last Answer : is terminated by efflux of K+
Description : Each preganglionic axon braches and can therefore synapse, with as many as a. 4 neurons b. 6 neurons c. 8 neurons d. 10 neurons
Last Answer : 10 neurons
Description : The fundamental structural and functional unit of nerves system is a. axon b. dendrite c. cell body d. neuron
Last Answer : neuron
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.
Description : The figure shows an axon terminal and synapse. Select the option giving correct identification of labels A-D. A C D B (a) A-Action potential, C-Neurotransmitter (b) B-Neurotransmitter, D- Receptor capsules (c) C-Receptor, D-Synaptic vesicles (d) A-Axon terminal, B- Serotonin complex
Last Answer : c) C-Receptor, D-Synaptic vesicles
Description : A diagram showing axon terminal and synapse is given. Identify correctly at least two of A - D. (a) A - Neurotransmitter, B - Synaptic cleft (b) C - Neurotransmitter, D - Ca++ (c) A - Receptor, C - Synaptic vesicles (d) B - Synaptic connection, D - K+
Last Answer : (c) A - Receptor, C - Synaptic vesicles
Description : What is Axon?
Last Answer : A long projection of the cell body that conducts messages away from the cell body is called axon.
Description : Which of the following statements describe the pathophysiology of post-polio syndrome? a) The exact cause is unknown, but aging or muscle overuse is suspected. The exact cause of post-polio syndrome is not ... , high-fat diet in polio survivors. The exact cause of post-polio syndrome is not known.
Last Answer : a) The exact cause is unknown, but aging or muscle overuse is suspected. The exact cause of post-polio syndrome is not known but researchers suspect that with aging or muscle overuse the neurons not destroyed originally by the poliovirus are unable to continue generating axon sprouts.
Description : Optic nerve axon emerges from: a. Ganglion cells b. Rods and cones c. Amacrine cells d. Inner nuclear layer
Last Answer : ANSWER: A
Description : Which of the following are NOT part of a neuron? a) synapse b) axon c) Nissl bodies d) dendrite
Last Answer : ANSWER: A -- SYNAPSE
Description : The filtration unit of kidney is (1) axon (2) nephron (3) neuron (4) yellow fiber
Last Answer : nephron
Description : Bundles of striated muscle fibres called fasciculi are surrounded by a sheath called :-
Last Answer : Bundles of striated muscle fibres called fasciculi are surrounded by a sheath called :- A. Epimysium B. Perimysium C. Exomysium D. Endomysium
Description : In most axons, the myelin sheath is interrupted at intervals of about 1 millimeter or more. These interruptions are called the: a) glial b) nodes of Ranvier (pron: ron-vee-ay) c) collaterals d) nodes of Babinet
Last Answer : ANSWER: B -- Nodes of Ranvier
Description : The white matter present in the brain and spinal cord consists of (a) neuroglia (b) myline sheath (c) terminal arborizations of axons (d) cellular sheath of Schwann
Last Answer : Ans:(b)
Description : Consider the following statements: 1. Propagation of a nerve impulse in a myelinated nerve fibre is different from that of unmyelinated fibre. 2. The impulse actually travels by leaping through the nodes of Ranvier in an unmyelinated fibre 3. ... incorrect? (a) 1, 2 (b) 1, 3, 4 (c) 2 only (d) 2, 3
Description : What is Myelin sheath?
Last Answer : They fatty sheath covering on the axon is called Myelin sheath.
Description : What is Myelin Sheath ?
Last Answer : : A layer of isolated fatty substance beneath the neurallama is called myelin sheath .
Description : Assertion :In `C_(4)` plants, the chloroplasts of bundle sheath cells are granal. Reason: PS II is mostly found in the appressed part of granum.
Last Answer : Assertion :In `C_(4)` plants, the chloroplasts of bundle sheath cells are granal. Reason: PS II ... false. D. If both Assertion and Reason are false.
Description : In `C_(4)` plants , mesophyll cells and bundle sheath cells are specialized to perform, respectively,
Last Answer : In `C_(4)` plants , mesophyll cells and bundle sheath cells are specialized to ... and photorespiration D. Photorespiration and dark reaction
Description : Myelin sheath is the covering of
Last Answer : Myelin sheath is the covering of A. Muscle cell B. Axon C. Blood vessels D. Osteocyte
Description : Gap between two adjacent myelinn sheath are known as
Last Answer : Gap between two adjacent myelinn sheath are known as
Description : Write the characteristics of bundle sheath cells of `C_(4)` plants
Last Answer : Write the characteristics of bundle sheath cells of `C_(4)` plants
Description : When in plant leaves, chloroplast containing bundle sheath cells surrounds vascular bundles in several layers that anatomy is known as
Last Answer : When in plant leaves, chloroplast containing bundle sheath cells surrounds vascular bundles in several layers that anatomy is known as
Description : What is the Inflammation of the sheath surrounding a tendon is known as?
Last Answer : Need answer
Description : Phospholipids occur in (A) Myelin sheath (B) Stabilizes chylomicrans (C) Erythrocyte membrane (D) All of these
Last Answer : Answer : D