Exam 3

The nervous system controls the activity of muscles and glands. Muscles and glands can generate changes and are therefore called

• afferents.

• effectors.

• stimuli.

• visceral.

Which is not a general function of the nervous system?

• Transporting materials throughout the body.

• Collecting information

• Processing and evaluating information

• Responding to information

• No exceptions; all are general functions of the nervous system

Which is not a characteristic of neurons?

• high mitotic rate

• high metabolic rate

• require continuous supplies of glucose and oxygen

• extreme longevity

• No exceptions; all of these are characteristic of neurons

Which statement is consistent with the current understanding of neural tissue?

• a person is born with all of the neurons they will ever have

• most neurons formed in fetal development last a lifetime, but some brain regions in adults generate new neurons

• neurons are constantly dying and being replaced throughout all regions of the brain

• stem cells in the brain become glia, which can later become neurons if there is a need for them to do so

based on function, the vast majority of neurons are

• sensory neurons

• motor neurons

• unipolar neurons

• bipolar neurons

• interneurons

a bipolar neuron has

• two axons extending from the cell body

• two dendrites extending from the cell body

• one axon and on dendrite extending from the cell body

• a single short process that extends from the cell body and then splits into a peripheral and a central branch

glial cells differ from neurons in that they

• are larger and capable of meiosis

• are smaller and capable of mitosis

• are found only in the CNS

• are found only in the PNS

• transmit nerve impulses much more slowly

the glial cell that helps to circulate cerebrospinal fluid is the

• astrocyte

• ependymal cell

• neurolemmocyte

• microglial cell

• oligodendrocyte

the glial cell with perivascular feet that wrap around capillaries in the CNS is the

• astrocyte

• ependymal cell

• neurolemmocyte

• microglial cell

• oligodendrocyte

the glossy-white appearance of most axons is due to

• the high lipid content of the myelin sheath

• their proximity to light-reflecting cartilage

• their proximity to white bone

• the white color of the perivascular feet

• the covering of ependymal cells