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