Chapter 11

Which one of the following establishes and maintains the resting potential?

sodium-potassium pump

Control of respiratory rate, heart rate, and blood pressure is integrated through the

Medulla oblongata

Which one of the following cells transmit impulses away from the central nervous system to the muscles and other organs?

Motor neurons

The central nervous system is enclosed by membranes or meninges called the

dura mater, pia mater, and arachnoid

Convergence occurs when several presynaptic cells

form a synapse with a single postsynaptic cell

During synaptic transmission, the influx of ________ causes vesicles in the axon bulb to fuse with the cell membrane, releasing ________.

Ca2+, neurotransmitter

Regulation of the production of breast milk, carbohydrate metabolism, and temperature control are some of the functions of the

Hypothalamus

Electrical impulses are transmitted between components of the central nervous system via which one of the following?

Interneurons

All of the following are functions of the myelin sheath EXCEPT which one?

The myelin sheath plays an important role in synaptic transmission.

Which one of the following steps occurs during the absolute refractory period?

The neuron cannot generate an action potential.

Motor neurons of the peripheral nervous system transmit impulses away from the central nervous system.

True

The central nervous system is composed of which of the following?

brain and spinal cord

Cells that provide direct protection and physical support to neurons are

neuroglial cells

During which one of the following phases of an action potential do the sodium channels close and potassium channels open, releasing potassium from the neuron?

repolarization

Excitatory neurotransmitters encourage the generation of new electrical impulses by which one of the following?

stimulating depolarization of postsynaptic neurons