A&P - nervous system

The term central nervous system refers to the ________.

• brain and spinal cord

• brain, spinal cord, and peripheral nerves

• spinal cord and spinal nerves

• peripheral and spinal nerves

What part of the nervous system performs information processing and integration?

• central nervous system

• parasympathetic nervous system

• sympathetic nervous system

• somatic nervous system

Which of the following allows us to consciously control our skeletal muscles?

• the somatic nervous system

• the parasympathetic division of the autonomic nervous system

• the afferent division of the nervous system

• the sympathetic division of the autonomic nervous system

Which of the following types of glial cells produces the myelin sheaths that insulate axons, or nerve fibers, in the central nervous system (CNS)?

• oligodendrocytes

• astrocytes

• ependymal cells

• microglia

Which of the following types of neurons carry impulses away from the central nervous system (CNS)?

• motor

• sensory

• afferent

• association

Bipolar neurons are commonly ________.

• found in the retina of the eye

• found in ganglia

• motor neurons

• called neuroglial cells

Which of the following is not characteristic of neurons?

• They are miotic

• They conduct impulses.

• They have an exceptionally high metabolic rate.

• They have extreme longevity.

Neuroglia that control the chemical environment around neurons by buffering ions such as potassium and recapturing and recycling neurotransmitters are ________.

• astrocytes

• oligodendrocytes

• schwann cells

• microglia

Ions are unequally distributed across the plasma membrane of all cells. This ion distribution creates an electrical potential difference across the membrane. What is the name given to this potential difference?

• Resting membrane potential (RMP)

• action potential

• Positive membrane potential

• Threshold potential

Sodium and potassium ions can diffuse across the plasma membranes of all cells because of the presence of what type of channel?

• leak channels

• Voltage-gated channels

• Ligand-gated channels

• Sodium-potassium ATPases