Question

the peripheral nervous system is made up of:
a. brain and motor neurons
b. brain and spinal cord
c. spinal cord and sensory neurons
d. motor and sensory neurons

the primary function of the sensory nerves is:
a. to enable the muscles to be activated to engage the flight response
b. to sense pain, heat and other sensory signals and send a message to the brain
c. to sense movement and light and send a message directly to the motor nerve
d. to sense movement and speed and send a message to the brain

which of the following is found in the ventricles of the cerebrum?
a. axons of the motor neurons
b. cerebrospinal fluid
c. myelin sheaths for all neurons
d. dendrites of the sensory neurons

Explanation:

Analyze components of the peripheral nervous system

The nervous system is divided into the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS consists of the Central Nervous System structures: the brain and spinal cord. The PNS consists of all the nerves and ganglia outside of the CNS, which primarily include sensory (afferent) and motor (efferent) neurons. Therefore, the PNS is made up of motor and sensory neurons.

Determine the primary function of sensory nerves

Sensory (afferent) nerves carry signals from sensory receptors throughout the body toward the central nervous system. Their primary role is to detect internal or external environmental stimuli—such as pain, temperature, touch, and chemical signals—and transmit this information to the brain and spinal cord for processing.

Identify the contents of cerebral ventricles

The ventricles of the brain are a network of communicating cavities filled with cerebrospinal fluid (CSF). This fluid is produced by the choroid plexus within the ventricles and serves to cushion the brain, provide immunological protection, and assist in cerebral blood flow autoregulation.

Answer:

Question 26

• a. brain and motor neurons
• b. brain and spinal cord
• c. spinal cord and sensory neurons
• d. motor and sensory neurons (Correct answer)

Question 27

• a. to enable the muscles to be activated to engage the flight response
• b. to sense pain, heat and other sensory signals and send a message to the brain (Correct answer)
• c. to sense movement and light and send a message directly to the motor nerve
• d. to sense movement and speed and send a message to the brain

Question 28

• a. Axons of the motor neurons
• b. Cerebrospinal fluid (Correct answer)
• c. Myelin sheaths for all neurons
• d. Dendrites of the sensory neurons