Question 1

The functions of the pupillary responses include .&#10;A)protecting the retina from damage by bright light&#10;B)testing the integrity of the sympathetic nervous system&#10;C)protecting the eyeball from damage&#10;D)assessing the ability of the eyelid to close

Accepted Answer

Protecting the retina from damage by bright light is a function of the pupillary responses.

Question 2

The neural pathway for a reflex is called&#10;A)a somatic reflex&#10;B)a reflex arc&#10;C)an intrinsic reflex&#10;D)an autonomic reflex

Accepted Answer

A reflex arc is the correct term for the neural pathway that a reflex follows. It typically involves a sensory neuron, an interneuron in the spinal cord or brain, and a motor neuron, resulting in a rapid, automatic response to a stimulus.

Question 3

Which statement is false about testing reflexes?&#10;A)Tests of reflexes can help localize the area of injury when the spinal cord has been damaged.&#10;B)The absence of reflex responses indicates pathology to the nervous system.&#10;C)It is very difficult to assess reflex responses.&#10;D)Exaggerated reflex responses indicate pathology to the nervous system.

Accepted Answer

Testing reflexes is a standard and straightforward procedure in neurological examinations, not considered very difficult. It involves simple techniques to elicit reflex responses, which can provide valuable information about the integrity of the nervous system.

Question 4

What is the first event associated with a reflex?&#10;A)The receptor detects a stimulus.&#10;B)The effector produces a response.&#10;C)The integrating center elicits a response.&#10;D)The integrating center receives information and makes decisions based upon the information.

Accepted Answer

The first event in a reflex arc is when the receptor detects a stimulus. This detection is what initiates the entire reflex process.

Question 5

The crossed extensor reflex is an example of a(n).&#10;A)somatic reflex&#10;B)voluntary reflex&#10;C)special senses reflex&#10;D)autonomic reflex

Accepted Answer

The crossed extensor reflex is a somatic reflex, which involves a response to a painful stimulus by not only withdrawing the stimulated part but also extending the opposite limb to maintain balance. This type of reflex is part of the body's way to protect itself from harm and is not under voluntary control, nor does it involve the autonomic nervous system or special senses directly.

Question 6

In nervous system physiology, the definition of a reflex is a _ .&#10;A)rapid, predictable, involuntary motor response to a stimulus&#10;B)voluntary response, which can be withheld&#10;C)well thought out, therefore slow, response to an emergency situation&#10;D)variable response to a startling stimulus

Accepted Answer

A reflex is characterized as a rapid, predictable, involuntary motor response to a stimulus, which does not involve conscious thought for its execution.

Question 7

Which of the following will cause the reaction time of a reflex to increase?&#10;A)rapid nerve conduction velocity&#10;B)great sensitivity of the receptors for the reflex&#10;C)a large number of neurons and their associated synapses&#10;D)rapid activation of the effector

Accepted Answer

A large number of neurons and their associated synapses in a reflex pathway will increase the reaction time because each synapse introduces a delay due to the time it takes for neurotransmitter release and binding.

Question 8

Predict which of the following reflexes will have the most rapid response time.&#10;A)the stretch reflex&#10;B)the crossed extensor reflex&#10;C)catching a ruler between your thumb and index finger&#10;D)applying the brakes when a person darts in front of your car

Accepted Answer

The stretch reflex is the most rapid because it involves a simple monosynaptic reflex arc, meaning there is a direct communication between sensory and motor neurons without any interneurons, allowing for a quicker response.

Question 9

Name the receptor for the stretch reflex.&#10;A)temperature receptors&#10;B)pain receptors&#10;C)tendon organ&#10;D)muscle spindle (indicates stretch on the muscle)

Accepted Answer

Muscle spindles are the receptors in muscles that are sensitive to stretch and thus trigger the stretch reflex to prevent muscle damage.

Question 10

An abnormal plantar reflex in an adult produces Babinski's sign, which indicates .&#10;A)nerve damage to the leg&#10;B)damage to the corticospinal tract&#10;C)damage to the dorsal columns&#10;D)damage to the muscles that move the ankle

Accepted Answer

Babinski's sign indicates damage to the corticospinal tract, which is part of the central nervous system that carries movement commands from the brain to the spinal cord and then to the muscles.

Question 11

Which statement about neural reflex arcs is incorrect?&#10;A)An afferent path leads to the integrating center and an efferent path leads away from it.&#10;B)Their function is to protect the body from harm caused by homeostatic imbalances or external events.&#10;C)They contain the following elements: receptor, integrating center, and effector.&#10;D)They are slowed down by the hormones involved.

Accepted Answer

The answer of Which statement about neural reflex arcs is...

Question 12

What is true about somatic reflexes?&#10;A)we are not usually aware of them&#10;B)they activate skeletal muscle&#10;C)they help prepare the body for &#34;fight- or- flight&#34;&#10;D)they are important in regulating digestion and blood pressure

Accepted Answer

The answer of What is true about somatic reflexes?&#10;A)we are...

Question 13

The pupillary light reflex is an example of a(n).&#10;A)voluntary reflex&#10;B)somatic reflex&#10;C)special senses reflex&#10;D)autonomic reflex

Accepted Answer

The answer of The pupillary light reflex is an example...

Deck 21: Human Reflex Physiology