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Flashcards in structure of blood vessels Deck (45):
1

hemodynamics

study of physical laws governing blood circulation

2

circulation through any vessel is influenced by

the content of blood and the container in which houses blood

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content of blood

# and type of cells and even shape of cells
-volume of water

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function of arteries

distribution system- pushes blood from heart to tissues

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function of capilaries

diffusion of nutrients and filtration ( collects waste)

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type of capillaries

continuous
fenestrated
discontinuous

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continuous capillaries

cells held together tightly
most common

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fenestrated capillaries

obvious pores that allow particles to go into ECF
-produce ultra filtrate

9

discontinuous capilaries

no real structure
allow passage of bigger substances such at proteins, triglycerides, amino acids
least common
-common in capillaries associated with the liver or hepatocytes

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if you have ablockage in your left coronary artery what suffers?

the whole left side of your heart

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WBC

defense against pathogens

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RBC

oxygen conveyance

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platelets

clotting

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blood is ____% plasma and ___% cells and dissolved nutrients

55% plasma (made up of 90% water 10 % dissolved substances)
45% cells and dissolved nutrients

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Red blood cell features

anucleated
have no mitochondria
make atp through glycolysis (means they cant make a lot)
biconvex shape

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biconvex shape significance

increased surface area can carry more 02 or diffusion of gasses

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turbulence

development of bubbles

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blood pressure can be an indication in

hydration levels

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albumin

a protein in blood important for maintaining osmolality of blood
-helps blood hold onto its water

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fibrinogen

a protein in blood important for blood clotting

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arborization

branching of vessels (giving a lot of resistance

22

from a single aorta we can have ______ capillaries!

4 x 10^10

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only ____% of all capillaries are open to flow at rest

25%

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how many miles of blood vessels

60,000

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we perfuse different areas of the body depending on what

depending on what autonomic tone we are in
-parasympathetic = rest and digest
- sympathetic = perfuse blood through to supply organs for fight or flight

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as we branch the radius of vessels ____

declines

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branching causes a drop in what

blood pressure

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large arteries have how much mm Hg

90 mm Hg

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arterioles mm Hg

60 mm Hg

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capillaries mm Hg

25 mm Hg

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venules and veins

15-3 mm Hg by the time you get back to the vena cava

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what is washing out the pressure?

the branching out
-too much pressure can damage capillary walls and cause edema

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why do we want low pressure in capillaries?

1. to prevent capillary wall damage
2. encourage diffusion of waste products
-if the pressure is too great it makes it difficult to move with conc. gradient

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significance of pressure decreasing

capillary walls are thing, if you send too much pressure in the capillary the walls will leak causing edema

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general structure of blood vessels

1. tunica intima
2. tunica media
3. tunica externa or adventitia

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tunica intima made of

endothelial cells
CT
elastic membrane

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tunica media made of

smooth muscle
neurons
elastic fibers and membranes

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tunica externa made of

connective tissue
nerves

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capillaries are only ___ cell layer thick and have a ____

one cell layer thick and a thin membrane

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large veins have a _____ within the tunica intima

1-way valve

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nerve fibers control blood flow by _____ or _____ the vessel

constricting or diolating the vessel

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why do veins have less smooth muscle?

because they don't have as much pressure associated with them

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vasoconstriction

smooth muscle cells contract occluding or closing of the lumen

44

vasodilation

widening of lumen
increased blood flow given by the activity of smooth muscles cells

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atherosclerosis

a lot of fat in the blood accumulating at first just pushing walls not affecting the lumen but over time starts to close off the lumen