Flashcards in vascular system Deck (23):
name the layers of arteries: inner most to outter?
1. tunica intima ( sometimes contain endothelial tissue)
2. tunica media (had elastic tissue)
3. tunica externa (cotton tissue, helps vessel maintain shape)
capillaries are made of? what are their jobs?
made of tunica intima
helps with gas exchange
what additional items do veins contain than arteries?
veins contain valves
veins are floppy while arteries are round.
tunica media larger in arteries.
what are some resistance in the vascular system?
1. vessel diameter
2. blood viscosity
3. vessel length
what is blood pressure?
amount of force blood exerts on blood vessels
what is systolic pressure?
blood created by contracting heart
what is diastolic pressure?
blood pressure created by relaxing heart.
some of the fluid in the bed of capillaries bed is loss.
force of blood driving fluid out of capillaries. created by blood pressure)
blood in capillaries is forces out of tissue
what compensates for the lack of pressure to flow through the veins?
the valves prevent backflow of blood.
remove blood from heart.
1. elastic arteries (change shape base on fluctuating pressure from heart)
2. constrict or dilate- muscular arteries
3. arterioles- smallest blood vessels to deliver blood into a capillary bed.
how do we get pulse pressure?
pulse pressure= systolic-diastolic
mean arterial pressure?
average pressure seen within arteries.
MAP= (2XDP) + SP DIVIDED BY 3
what determines amount of blood that can enter capillary bed?
what determines amount of fluids entering a capillary bed?
determine by net filtration pressure
based on two things: hydrostatic pressure and colloid osmotic pressure
colloid osmotic pressure?
attraction of fluid to protein in blood.
(attacted into capillary bed)
lower than hydrostatic pressure.
what is the purpose of the lymphatic cappillaries?
excess fluid that enters the tissue is drained by the lympatic system.
name all the 6 componenst that work in the capillaries
1. arterioles lead to
2. precapillary sphincters
3. hydrostatic fluid
4. colloid pressure
5. lymphatic capillaries
what prevents backflow in veins?
the muscular pump that contains valves
how does the respiratory pump work/
inhaling puts pressure on abdomen and less pressure on thorax.
this forces blood to move up the inferior vena cava.
in both pumps, venous valves ensure that movement will always be in direction of the heart.
what two pumps help bring blood to the heart?
muscular pump and respiratory pump. both compensate for the lack of pressure in the veins.
what are natural ways to repair arteries?
normal process of damage and repair in arteries.