Nervous System P. 1&2 Mini -Test AP I

In general, the nervous system

• controls only conscious activities.

• is long lasting.

• is fast acting.

• responds to changes in the external environment only.

• is one of the simplest organ systems.

Muscles and glands are:

• effectors

• receptors

• part of the peripheral nervous system

• part of the central nervous system

• myelinated

These cells in the CNS have cilia that move in order to circulate cerebrospinal fluid.

• oligodendrocytes

• astrocytes

• ependymal cells

• Schwann cells

Which of these neuroglial cells forms the myelin sheath in the central nervous system:

• oligodendrocytes

• ependymal cells

• astrocytes

• Schwann cells

The somatic nervous system controls voluntary actions and the autonomic nervous system oversees involuntary actions.

• True

• False

Depolarization of neurons results from the entry of sodium ions into the cell.

• True

• False

The diffusion of potassium ions out of a neuron causes it to experience:

• a graded potential

• a nerve impulse

• an action potential

• depolarization

• repolarization

An action potential is caused by an influx of these ions into the cell:

• magnesium

• potassium

• calcium

• sodium

Motor (efferent) division

• Structural nervous system subdivision that consists of the brain and spinal cord

• Functional nervous system division that carries information from the central nervous system toward effectors

• Subdivision of the motor division responsible for controlling involuntary events

• Structural nervous system subdivision that consists of spinal nerves and cranial nerves

• Functional nervous system subdivision that carries information toward the central nervous system from receptors

Transmitting an impulse from one neuron to another involves a(n)

• impulse stimulating presynaptic dendrites to release a neurotransmitter into a synaptic cleft.

• neurotransmitter traveling from presynaptic dendrites across a synapse to postsynaptic axons or a cell body.

• impulse stimulating a presynaptic axon to release a neurotransmitter into a synaptic cleft.

• neurotransmitter traveling from postsynaptic axons across a synapse to presynaptic dendrites or a cell body