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