MAP review questions nervous tissue

The glial cells responsible for maintaining the blood-brain barrier are the

astrocytes

Saltatory conduction

is faster than conduction on an unmyelinated axon

The arrival of an action potential at the end of an axon results in the ________.

release of a neurotransmitter from the axon terminal

what is the function of the efferent division of the nervous system?

sending signals to muscles

Which of the following provides control over skeletal muscles?

somatic nervous system

Identify the correct sequence of steps in the generation of an action potential. 1. Activation of sodium channels and rapid depolarization 2. Inactivation of sodium channels and activation of potassium channels 3. Depolarization to threshold 4. Closing of potassium channels

3, 1, 2, 4

The resting potential of a neuron is ________.

-70mV

The brain and spinal cord comprise the

Central nervous system

Most neurons in the brain are

multipolar

When a neuron is at rest, which ion passes through its membrane most easily?

potassium

The part of the peripheral nervous system that brings information to the central nervous system is the

afferent division

Which of the following pairs are mismatched? axons: send messages cell body: nucleus dendrites: receive messages All are matched correctly.

all are matched correctly

The ________ nervous system provides involuntary regulation of smooth muscle, cardiac muscle, and glandular activity.

autonomic

Opening of voltage-gated sodium channels in the membrane of a neuron results in

depolarization

Oligodendrocytes are to CNS as ________ are to PNS.

schwann cells

Which of the following is the correct order of events that occur at a cholinergic synapse? 1. Extracellular calcium enters the axon terminal, triggering the exocytosis of acetylcholine. 2. Acetylcholine is removed by acetylcholinesterase. 3. Acetylcholine binds to receptors and depolarizes the postsynaptic membrane. 4. Axon terminal depolarizes.

4, 1, 3, 2