Question 1

Which of the following is (are)true of a motor response triggered by a reflex stimulus

Accepted Answer

All of the options are correct. A motor response triggered by a reflex stimulus can be simple or complex, it may involve responses from multiple interneuron pools, it may cause a strong action due to the effector organ acting in an unopposed manner, and it can be damped by mediation from the centers in the brain.

Question 2

The stretch reflex

Accepted Answer

The stretch reflex is exemplified by the knee jerk or patellar reflex, which is a classic example of this type of reflex.

Question 3

In the simplest reflex arc,

Accepted Answer

In the simplest reflex arc, the sensory neuron synapses directly with a motor neuron, without involving any interneurons or other neurons in between. This direct connection allows for quick and automatic responses to certain stimuli. Therefore, choice C is the best option.

Question 4

The increased amount of gray matter in the lumbar region of the spinal cord is known as the ________.

Accepted Answer

The answer of The increased amount of gray matter in...

Question 5

Which stretch reflex is the most appropriate to test when attempting to diagnose damage to the radial nerve

Accepted Answer

The answer of Which stretch reflex is the most appropriate...

Question 6

A slender strand of fibrous tissue from the pia mater that blends into the coccygeal ligament and forms the most inferior extension from the spinal cord that anchors it to the sacral region is the ________.

Accepted Answer

The answer of A slender strand of fibrous tissue from...

Question 7

Activation of a motor neuron during the processing of a reflex action

Accepted Answer

Activation of a motor neuron during the processing of a reflex action carries the nerve impulse to the peripheral effector organs in order to produce a response. It is not instantaneous (A), and it does not typically enhance the original stimulus (C). The response is sent through the ventral root, not the dorsal root (D). Therefore, the correct answer is B.

Question 8

Groups of neuron cell bodies in the dorsal root are called ________.

Accepted Answer

The answer of Groups of neuron cell bodies in the...

Question 9

The stretch reflex innervated by the musculocutaneous nerve is the

Accepted Answer

The biceps reflex is innervated by the musculocutaneous nerve and results in the contraction of the biceps brachii muscle in response to tapping on the tendon of the biceps brachii.

Question 10

Every spinal segment is associated with a pair of ________ that contain the cell bodies of sensory neurons.

Accepted Answer

The answer of Every spinal segment is associated with a...

Question 11

How do higher centers in the brain influence reflexive motor activities

Accepted Answer

Higher centers in the brain can influence reflexive motor activities by sending signals through descending tracts to enhance or suppress spinal reflexes.

Question 12

The outermost layer of the meninges is the ________.

Accepted Answer

The answer of The outermost layer of the meninges is...

Question 13

Which of the following is true of receptors

Accepted Answer

Receptors are specialized structures present in different parts of the body that monitor conditions inside the body or in the external environment. They can detect various stimuli, such as changes in temperature, pressure, or chemical composition, and send signals to the nervous system for processing and response. Options A, B, and D are incorrect as receptors can be located throughout the body and have different structures and functions depending on their location and type. Option E is incorrect as there is at least one correct answer.

Question 14

The cerebrospinal fluid is located in the ________.

Accepted Answer

The answer of The cerebrospinal fluid is located in the...

Question 15

In the correct order, the steps involved in a neural reflex are: (1)information processing
(2)activation of a sensory neuron
(3)arrival of a stimulus and activation of a receptor
(4)activation of a motor neuron
(5)response of a peripheral effector

Accepted Answer

The correct order of the steps in a neural reflex is as follows:
(3) Arrival of a stimulus and activation of a receptor
(2) Activation of a sensory neuron
(1) Information processing
(4) Activation of a motor neuron
(5) Response of a peripheral effector
Therefore, option C, which lists the steps in the correct order, is the best choice.

Question 16

Higher brain centers are able to

Accepted Answer

Higher brain centers can influence spinal reflexes in a series of interactive levels, meaning that they can either facilitate or inhibit reflex activity. Therefore, they are not solely responsible for suppressing or permitting reflexes, but rather work in conjunction with spinal reflexes. It is also not accurate to say that higher brain centers have no effect on reflexes, as they play a significant role in modulating reflex activity. Additionally, training the spinal cord is not a function of higher brain centers.

Question 17

A(n)________ is a regional anesthesia produced by the injection of an anesthetic into the epidural space near targeted spinal nerve roots.

Accepted Answer

The answer of A(n)________ is a regional anesthesia produced by...

Question 18

The meningeal membranes are continuous with the connective tissues surrounding the ________ and their peripheral branches.

Accepted Answer

The answer of The meningeal membranes are continuous with the...

Question 19

Spinal reflexes

Accepted Answer

Spinal reflexes can be both monosynaptic or polysynaptic and involve multiple segments of the spinal cord. While some reflexes may transmit information to the brain, many may not require this processing and can occur solely within the spinal cord.

Question 20

Polysynaptic reflexes can produce far more complicated responses than monosynaptic reflexes because

Accepted Answer

Polysynaptic reflexes involve interneurons which can trigger the activation of multiple muscle groups, leading to more complicated responses than the simple one-to-one connections of monosynaptic reflexes.

Quiz 14: The Nervous System: The Spinal Cord and Spinal Nerves

Which of the following is (are) true of a motor response triggered by a reflex stimulus