Circulatory 1 Flashcards
1
Q
Blood flow
A
- higher to lower pressure
(pressure gradient) / (resistance of blood vessels) = flow of blood
2
Q
Driving pressure for flow, created by:
A
Left Ventricle
3
Q
Vascular Tree
A
CONSISTS OF:
- arteries
- arterioles
- capillaries
- venules
- veins
- lymph vessels
4
Q
3 layers of vasculature
A
connective tissue
smooth muscle
endothelium
5
Q
Collagen Fibers
A
- tensile strength
- reinforces so no bulging
6
Q
Elastin Fibers
A
- stretch / recoil of walls
7
Q
Arterioles
A
- Major resistance vessels
- radius can be adjusted (depending on output needed + to help with blood pressure)
- acts to smooth out pulsatile flow
VASOCONSTRICTION:
- smaller, more resistance, less flow
- contraction of smooth muscle
VASODILATION:
- larger, bigger radius, less resistance
- relaxation of smooth muscle
- less resistance and more flowF
- occurs with less 02, more CO2 and more lactic acid
8
Q
blood supply remains constant to ______
A
brain
9
Q
Factors that affect vascular tone
A
- metabolite
- histamine release
- endothelial factors
- heat or cold
- stretching
10
Q
Arterioles Vasoconstriction
A
VASOCONSTRICTION:
- smaller, more resistance, less flow
- contraction of smooth muscle
11
Q
Arterioles Vasodilation
A
VASODILATION:
- larger, bigger radius, less resistance
- relaxation of smooth muscle
- less resistance and more flowF
- occurs with less 02, more CO2 and more lactic acid
12
Q
Which system innervates the blood vessels?
A
Sympathetic
13
Q
Alpha 1 Receptors
A
- Norepinephrine
- Vasoconstrict
Arterioles
14
Q
Alpha 2 Receptors
A
- Epinephrine
- heart/skeletal muscle
- Vasodilate
Arterioles
