Stretch Reflex

STRETCH REFLEX

Q. 1

Which of the following is FALSE regarding stretch reflex?

 A

Stretch of the muscle initiates the reflex

 B

Relaxation of the muscle is the response

 C

Muscle spindle is the sense organ

 D

Impulse are conducted by fast sensory fibres

Q. 1

Which of the following is FALSE regarding stretch reflex?

 A

Stretch of the muscle initiates the reflex

 B

Relaxation of the muscle is the response

 C

Muscle spindle is the sense organ

 D

Impulse are conducted by fast sensory fibres

Ans. B

Explanation:

Stretch reflex: When a muscle is stretched there is reflex contraction of the stretched muscle. Reflex is initiated by the stretch of the muscle and the respone is contraction of the muscle that is being stretched. Muscle spindle is the sense organ for this reflex and the impulse are carried by the fast sensory fibres to the CNS.

Ref: Ganong’s Review of Medical Physiology, 21st Edition, Page 130


Q. 2

Lowest most level of integration of stretch reflex is at

 A

Cerebral cortex

 B

Medulla

 C

Lower medulla

 D

Spinal cord

Q. 2

Lowest most level of integration of stretch reflex is at

 A

Cerebral cortex

 B

Medulla

 C

Lower medulla

 D

Spinal cord

Ans. D

Explanation:

D i.e. Spinal cord


Q. 3

Muscle spindle is –

 A

Receptor for a variety of multisynaptic reflexes

 B

Receptor for myotatic or stretch receptor reflex

 C

Occurs only in antigravity extensor muscles

 D

Excited by both stretch and contraction of the muscles in which it is Located

Q. 3

Muscle spindle is –

 A

Receptor for a variety of multisynaptic reflexes

 B

Receptor for myotatic or stretch receptor reflex

 C

Occurs only in antigravity extensor muscles

 D

Excited by both stretch and contraction of the muscles in which it is Located

Ans. B

Explanation:

B i.e. Receptor for stretch receptor reflex


Q. 4

Function of a muscle spindle is:

September 2009

 A

Regulates withdrawl reflex

 B

Maintains muscle tone

 C

Feedback device to maintain muscle length

 D

Receptor for inverse stretch reflex

Q. 4

Function of a muscle spindle is:

September 2009

 A

Regulates withdrawl reflex

 B

Maintains muscle tone

 C

Feedback device to maintain muscle length

 D

Receptor for inverse stretch reflex

Ans. C

Explanation:

Ans. C: Feedback device to maintain muscle



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