Reflex actions are very rapid, involuntary, stereotyped behaviours in which some kind of stimuli evoke a fast, short lived response. Select the correct option w.r.t. reflex actions Statement A : In a Knee-jerk reflex, more than one synapse is formed in the reflex path. Statement B : The afferent neurons in a reflex action transmit the impulses received from sensory organs via dorsal nerve root into CNS
A
Statement A is correct, statement B is incorrect
B
Statement A is incorrect, statement B is correct
C
Both A & B are correct statements
D
Both A & B are incorrect statements
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Assertion:Reflex arc comprises of at least one afferent neuron, one efferent neuron and a part of PNS. Reason:The efferent neuron receivers signal from a sensory organ and transmits the impulse via a ventral nerve root into the PNS.
A cylindrical structure P in our body begins in continuation with medulla and extends downwards. It is enclosed in a bony cage Q and surrounded by membranes R. As many as x pairs of nerve arise from the structure P. The structure P is involved in the reflex actions of our body and conduction of nerve impulse to and from another organs S of our body with which it forms CNS. (a) Name the structure P. (b) Name (i) bony cage Q, and (ii) membranes R. (c) How much is x? (d) Name the organ S. (e) What are the reflexes involving structure P only known as?
Fill in the blanks according to the process of reflex action. ltBrgt 1. The reflex pathway comprises at least one …a… neuron (receptor) and one …b… (effector or excitor) neuron appropriately arranged in a series 2. The …a… neuron receives signal from a sensory organ and transmit the impulse via a ...c... nerve root into the CNS (at the level of spinal cord). ltBrgt 3. The ...b... neuron then carriers signals from CNS to the effector. 4. The stimulus and response thus form a reflex ...d...
Read the following statements and choose the correct option w.r.t. true and false statements. (a) Sensory ganglion concerned with spinal reflex arc is located in ventral root of spinal cord. (b) Spinal accessory and hypoglossal nerves are not cranial nerves in frog. (c) Parasympathetic ganglia lie near or within the visceral organs. (d) Sympathetic nerve fibres constitute the thoracico-lumbar outflow
Read the given statements and select the correct ones. (i)Autonomic neural system transmits impulses from the CNS to the voluntary organs and striated muscles of the body. (ii)Unmyelinated nerve fibres do not have Schwann cells which form the myelin sheath. (iii)Axonal membrane of a neuron while not conducting any impulse is comparatively more permeable to potassium ions (K^+) than to sodium ions (Na^+) (iv)A synapse is formed by the membranes of presynaptic neuron and a post synaptic neuron.
