Question 1

Which of the following best describes the function of a reflex arc?

Accepted Answer

A rapid, involuntary response to a stimulus.

Question 2

What is the correct sequence of steps in a typical spinal reflex arc?

Accepted Answer

Receptor → Sensory neuron → Integration center → Motor neuron → Effector

Question 3

Which stage of a reflex arc would be significantly different in a reflex initiated by the brain compared to one initiated by the spinal cord?

Accepted Answer

Integration

Question 4

In the stretch reflex, which structure detects the initial stimulus?

Accepted Answer

Muscle spindle

Question 5

How would you classify the pupillary light reflex, which causes your pupils to constrict when exposed to bright light?

Accepted Answer

Autonomic, innate, polysynaptic

Question 6

Which of the following reflexes is contralateral?

Accepted Answer

Crossed-extensor reflex

Question 7

During a strength training session, Wilfried says his tendon reflex is helping him enhance his muscular endurance. Is he correct? Why or why not?

Accepted Answer

No; the tendon reflex is preventing excessive muscle tension.

Question 8

Which mechanism causes golgi tendon organs to start firing action potentials?

Accepted Answer

As the muscle contracts, collagen fibers 'squeeze' the nerve endings of the golgi tendon organ.

Question 9

Which of the following is a characteristic of a monosynaptic reflex?

Accepted Answer

It involves a single synapse during integration.

Question 10

Why is reciprocal inhibition an important part of the stretch reflex?

Accepted Answer

It allows for smooth movement of extensor and flexor muscles.

Question 11

Which of the following best describes the function of the integration center in a reflex arc?

Accepted Answer

It consists of interneurons or a single synapse between sensory and motor neurons.

Question 12

A patient steps on a sharp object and immediately withdraws their foot while simultaneously extending the opposite leg. Which reflexes are involved?

Accepted Answer

Flexor reflex and crossed-extensor reflex

Question 13

Which of the following is true about the tendon reflex?

Accepted Answer

It is a polysynaptic reflex.

Question 14

Which type of reflex is genetically programmed during natural development?

Accepted Answer

Innate reflex

Question 15

What is the primary purpose of the stretch reflex?

Accepted Answer

To prevent muscle strain and tear injuries

Question 16

Which of the following best describes the effector in a reflex arc?

Accepted Answer

A gland or muscle fiber that responds to the stimulus by secreting or contracting

Question 17

Which reflex is responsible for the rapid withdrawal of a body part from a painful stimulus?

Accepted Answer

Flexor (withdrawal) reflex

Question 18

Which of the following is an example of an acquired reflex?

Accepted Answer

Conditioned taste aversion

Question 19

Which equation best represents the relationship between the number of synapses and the complexity of a reflex arc?

Accepted Answer

$$	ext{Complexity} = 	ext{Number of Synapses}$$

Question 20

If a reflex arc involves both ipsilateral and contralateral responses, which reflex is most likely being described?

Accepted Answer

Crossed-extensor reflex

Reflex Arcs and Their Classification: Study Notes for Anatomy & Physiology

Study Guide - Practice Questions