Anatomy Lab

the main function of the cell body is to

• regulate the external environment around the neuron

• generate and transmit signals in the form of action potentials

• function as the biosynthetic center of the neuron

• form the myelin sheath

action potentials are generated across the plasma membrane of

• cell bodies

• dendrites

• an axon

• the myelin sheath

• more than one of the above can generate action potentials

____ are neuroglial cells that form the myelin sheath in the peripheral nervous system

____ are neuroglial cells that form the myelin sheath in the central nervous system

which of the following cell types circulates cerebrospinal fluid with cilia

• microglial cells

• astrocytes

• neurolemmocytes

• ependymal cells

what happens during the hyperpolarization stage of a neuronal action potential

• sodium ions diffuse into the cell, making the membrane potential more positive than resting

• sodium ions diffuse out of the cell, making the membrane potential more negative than resting

• potassium ions diffuse into the cell, making the membrane potential more positive than resting

• potassium ions diffuse out of the cell, making the membrane potential more negative than resting

an excitatory postsynaptic potential

• brings the cell closer to threshold and more likely to have an action potential

• brings the cell closer to threshold and less likely to have an action potential

• brings the cell farther away from threshold and more likely to have an action potential

• brings the cell farther away from threshold and less likely to have an action potential

the influx of calcium ions into the axon terminal of the presynaptic neurons triggers

• the opening of ion channels in the membrane of the postsynaptic neuron

• the release of neurotransmitters from synaptic vesicles by exocytosis

• hyperpolarization of the postsynaptic membrane

• an inhibitory postsynaptic potential in the post synaptic neuron

the longitudinal fissure separates the

• cerebrum from the cerebellum

• two cerebral hemispheres

• cerebral cortex from cerebral white matter

• temporal lobe from the frontal and parietal lobes

the deep lobe of the cerebrum is the

• temporal lobe

• occipital lobe

• parietal lobe

• insula lobe