1) bone is composed of ________ percent cells.
a) 25
b) 10
c) 2
d) 15
e) 50
2) in general, autonomic tone of peripheral blood vessels increases when
a) sympathetic stimulation is increased.
b) sympathetic stimulation is decreased.
c) parasympathetic stimulation is increased.
d) parasympathetic stimulation is decreased.
e) somatomotor stimulation is increased.
3) the brain requires a substantial blood supply. the vessels that deliver blood to the
brain are the
a) external carotid arteries.
b) facial arteries.
c) jugular veins.
d) internal carotid and vertebral arteries.
e) dural sinuses.
4) ipsps (inhibitory postsynaptic potentials)
a) are local depolarizations.
b) are local hyperpolarizations.
c) increase membrane permeability to sodium ions.
d) block the efflux of potassium ions.
e) block the efflux of calcium ions.
5) in what vessel is blood pressure the highest?
a) artery
b) arteriole
c) capillary