LEC EXAM #3 CHP 13 Flashcards
How does laying down effect venous return?
Stretching of heart increases venous return= increase in SV and CO
How does standing up effect venous return?
Decreases venous return due to blood flowing to the legs= decrease in SV and CO
MAP formula:
CO x resistance= MAP
A blood volume drop causes:
BP to drop
Decrease in MAP feedback loop:
Stimulus: : Decrease in MAP
Sensor: Baroreceptors in the aortic arch and carotid sinus
Integrator: Medulla oblongata
Effector: Heart and arteries
Response: Heart will increase CO and increase resistance (vasoconstrict)
Result: Increase in MAP
MAP must be _____ to get blood flow to the organs:
55 mmHg
Heart, blood vessels, and blood work to transport: (4)
- Oxygen and nutrients to cells
- Wastes from cells to liver and kidneys
- Hormones, immune cells, and clotting proteins to target cells
- Maintain pressure in vessels so blood will flow to organs and tissues
How much is systemic pressure?
85 mmHg
Due to flow being the same in systemic and pulmonary pressure…
Resistance must be lower in pulmonary circuit
Capillary fluid exchange
__________________
Fluid movement through openings beta adjacent endothelial cell occurs via:
Osmosis
How much is pulmonary pressure?
15 mmHg
Capillary fluid exchange
__________________
Fluid movement into interstitial is driven by:
Hydrostatic pressure
Capillary fluid exchange
__________________
Fluid movement into blood is driven by:
Osmotic pressure (oncotic pressure) due to particles
Capillary filtration: (4)
- movement of fluid into interstitium
- driven by hydrostatic
- water and small solutes forced through gaps between endothelial cells
- leaves larger solutes (glucose + albumins) in blood stream
Capillary reabsorption:
- movement of fluid back into capillary
- driven by blood colloid osmotic pressure
- colloid osmotic pressure in blood > interstitium due to suspended blood proteins (albumin) that are too large to cross capillary walls
