Question 1

Which of the following best describes the difference between a monosynaptic and a polysynaptic reflex arc?

Accepted Answer

A monosynaptic reflex arc has a direct connection between sensory and motor neurons, while a polysynaptic reflex arc includes one or more interneurons.

Question 2

During the patellar tendon reflex, which of the following best explains why the quadriceps muscle contracts?

Accepted Answer

The muscle spindle detects stretching, sending impulses via sensory neurons to the spinal cord, which then directly activates the motor neuron to the quadriceps.

Question 3

If a person steps on a sharp object with their right foot, which reflex pathway is responsible for lifting the right foot and extending the left leg for balance?

Accepted Answer

Crossed extensor reflex

Question 4

Which of the following is TRUE regarding the Golgi tendon organ?

Accepted Answer

It detects muscle tension and can inhibit muscle contraction to prevent damage.

Question 5

A patient has damage to the integration center in the spinal cord for the withdrawal reflex. What is the most likely outcome?

Accepted Answer

The patient will be unable to withdraw the limb from painful stimuli.

Question 6

Which equation best represents the relationship between the speed of a reflex response ($$v$$), the length of the neural pathway ($$d$$), and the conduction velocity of the neuron ($$c$$)?

Accepted Answer

$$t = \frac{d}{c}$$

Question 7

Which of the following best explains why the Achilles tendon reflex is slower than the patellar tendon reflex?

Accepted Answer

The neural pathway for the Achilles tendon reflex is longer, increasing the time required for the signal to travel.

Question 8

Which of the following is a real-life example of a contralateral reflex?

Accepted Answer

Extending your left leg when you step on a sharp object with your right foot.

Question 9

Which of the following statements about the muscle spindle is correct?

Accepted Answer

It is responsible for detecting muscle stretch and initiating the stretch reflex.

Question 10

A patient presents with exaggerated deep tendon reflexes. Which of the following is the most likely cause?

Accepted Answer

Loss of descending inhibitory input from the brain to the spinal cord.

Question 11

Which of the following best describes the role of interneurons in a polysynaptic reflex arc?

Accepted Answer

They connect sensory neurons to motor neurons, allowing for more complex responses.

Question 12

Which of the following equations correctly represents Ohm's Law as it applies to nerve conduction, where $$V is $$voltage, $$I is $$current, and $$R is $$resistance?

Accepted Answer

$$V = I 	imes R$$

Question 13

Which of the following would most likely result from damage to the sensory neuron in a reflex arc?

Accepted Answer

The reflex response would be absent.

Question 14

In the context of the withdrawal reflex, which of the following best explains the concept of reciprocal inhibition?

Accepted Answer

Activation of the agonist muscle is accompanied by inhibition of the antagonist muscle.

Question 15

Which of the following best explains why reflexes are important for survival?

Accepted Answer

They provide rapid, automatic responses to potentially harmful stimuli.

Question 16

Which of the following is the correct sequence of events in a typical reflex arc?

Accepted Answer

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

Question 17

A patient is unable to perform the patellar tendon reflex. Which structure is most likely damaged?

Accepted Answer

Muscle spindle

Question 18

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

Accepted Answer

It processes sensory input and determines the appropriate motor response.

Question 19

Which of the following is an example of a learned reflex?

Accepted Answer

Braking when you see a red light while driving

Question 20

Which of the following best explains why the crossed extensor reflex is considered a polysynaptic reflex?

Accepted Answer

It involves multiple interneurons and synapses to coordinate responses in both limbs.

Reflex Pathways and Muscle Stretch Reflexes in Anatomy & Physiology

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