Chapter 15 Flashcards
(24 cards)
what does the systolic pressure measure?
blood vessel wall
what does the diastolic pressure measure?
blood in the arteries when the heart is filling
What contributes to your mean arterial pressure? MAP
blood voulme
effectiveness of the heart as a pump
resistance of the system to the blood flow
relative distribution of blood between arterial and venous blood vessels
The elastic system arteries
are a pressure reservoir that maintains blood flow during ventricular relaxation
Systemic veins
serve as an expandable volume reservoir
Where does exchange between blood and cells take place?
in the capillaries
when your heart contracts it fills…
blood into your arteries and they extend
when your heart relaxes…
the arteries restrict and push blood
single-unit smooth muscle cells
are connected by gap junctions and the cells contract as a single unit
multi-unit smooth muscle cells
are NOT linked and must be stimulated independent
What neuron transmitter causes vasodilation or vasoconstriction?
norepinephrine (sympathetic system)
What controls the dilation or constriction of blood vessels?
vasoconstriction and vasodilation
Capillaries
associate the exchange of material between your cells are your cardiovascular system.
Continuous capillaries
has tight junctions, have leaky junctions
Fenestrated capillaries
have large pores
slow response
(pee) get rid of water -compensation by kidneys
fast response
compensation by cardiovascular system- cardiac output or vasodilation
What are precapillary sphincters?
band of smooth muscle that adjust blood flow to the capillaries
What reflex controls your blood pressure?
Baroreceptor reflex
What is the cardiovascular control center?
Medulla
Where are the baroreceptor found??
carotid arteries and aorta
What holds actin and myosin in place?
dense bodies
Slide 10 (17:50)
Slide 11
What is the smooth muscle called which allows it to acted as value, that creates blood flow?
precaoillary sphincters
