5 - Reflexes

Question 1

What type(s) of reflex does knee jerk reflex belong to?

Answer 1

• monosynaptic reflex
• spinal reflex
• somatic reflex

Question 2

________ can be seen in knee jerk reflex in which there is an interneuron which inhibits the antagonist muscle, allowing minimal resistance.

Answer 2

Reciprocal inhibition

Question 3

What type(s) of reflex does withdrawal jerk reflex belong to?

Answer 3

Polysynaptic reflex

Involves intersegmental reflex arcs – interneurons activate motor neurons in several spinal cord levels

Question 4

Crossed extensor reflex Involves a ___________ (in addition to reciprocal inhibition)

Answer 4

contralateral reflex arc

Triggered at the ipsilateral side; activate extensor muscle and inhibit flexor muscle on the contralateral limb to shift body load.

(right side foot stepped on pin > shift body weight to left leg)

Question 5

CNS reflexes are integrated in _____ and ______. (control centres)

Answer 5

hypothalamus and brainstem

Can be subdivided into cranial (pupillary light reflex) / spinal reflex (urination, defecation, penile erection/ ejaculation)

Question 6

Insulin secretion to regulate [glucose] is a kind of ________ reflex.

Answer 6

Endocrine

Hormone secretion involving a negative feedback

Question 7

__________ is a kind of reflex in which sensory inputs gathered by the nervous system and are passed on to endocrine system

Answer 7

Neuroendocrine reflex

Question 8

Draw a flow chart when processing sensory input and motor input by the spinal cord.

Answer 8

Sensory inputs (somatic/ visceral)  > Dorsal root ganglion >  dorsal gray horn >
a. Ventral horn : somatic motor neurons 

OR

b. Lateral horn : visceral motor neurons

> ventral root