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Reflex Arc

The reflex ar...

Question

The reflex arcs in which one or more interneurons connect the afferent and efferent signals are

A

Autonomic reflex

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B

Somatic reflex

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C

Monosynaptic reflex

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D

Polysynaptic reflex

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Solution

The correct option is A Polysynaptic reflex
Monosynaptic reflex is a type of reflex in which the reflex arc consists of only two neurons, one sensory neuron, and one motor neuron. Monosynaptic refers to the presence of a single chemical synapse.
By contrast, in polysynaptic reflex arcs, more than one relay neurons connect the sensory and motor neuron.
Polysynaptic reflex or spinal reflex or withdrawal reflex protects the body from the damaging stimulus. It is located in the spinal cord.

Therefore, the correct answer is option D.

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In a reflex arc, ______________ connects different neurons together and sends the signal from one neuron to another.

Q. Match the terms to these definitions.
all-or-none law, colour vision, afferent nerves, efferent nerves, fovea centralis, impulse, macula lutea, myopia, neuron, reflex, statoreceptor, visual acuity, meninges, blind spot.
.......... The ability to discriminate light on the basis of wavelength composition.

Q. Match the terms to these definitions:
all-or-none law, colour vision, afferent nerves, efferent nerves, fovea centralis, impulse, macula lutea, myopia, neuron, reflex, statoreceptor, visual acuity, meninges, blind spot
.......... are the nerves which conduct nerve impulses from the central nervous system to the peripheral organs and tissues.

Q. Match the terms to these definitions:
all-or-none law, colour vision, afferent nerves, efferent nerves, fovea centralis, impulse, macula lutea, myopia, neuron, reflex, statoreceptor, visual acuity, meninges, blind spot
.......... is a wave of excitation transmitted through a nerve that results in physiological activity

Q. Which of the following is/are incorrect?
I) Reflex arc is the pathway that involves the transmission of impulse from CNS to effector organ only
II) Relay neuron connects the sensory and motor neuron.
III) The nerve that carries the impulse towards the CNS is an afferent nerve.
IV) Part of the central nervous system involved in reflex action can be spinal cord, ganglion or brain.
V) Withdrawal of hand or foot on being pricked is not an example of reflex action.

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