What is they have poor pressure so the valves prevent back flow
100
What is the function of the capillary sphincter
What is to guard the capillary beds and control blood flow
100
What is the distribution of blood in the vessels?
What is veins have 60-65% and arteries have 30-35%
100
What is turbulence? Example?
What is inefficient blood flow? Garden hose phenomenon.
200
What carries blood towards the heart?
What is veins?
200
Do areties or veins have more elasticity?
What is arteries?
200
What are the characteristics of sinusoidal capillaries?
What is have gaps between endothelial cells, free exchange in the liver, spleen, bone marrow, and endocrine glands.
200
Bloos loss triggers what reaction for the vessels?
What is vasoconstriction, the liver, skin, lungs will redistribute deoxygenated blood.
200
What are the three types of capillary pressure/exchange?
What is diffusion (moving ions from concentration gradients), filtration (hydrostatic pressure(out of), leaves larger solutes in blood stream), reabsorption (creates osmotic pressure(into))
300
What is the purpose of vasoconstriction and vasodilation?
What is to regulate temperature
300
What is an aneurysm
What is a bulge in an arterial wall causing a weak spot in the elastic fibers
300
What are the characteristics of continuous capillaries?
What is What is have endothelial lining, found in all tissues except epithelial, permit water diffusion and only small solutes or lipid soluble materials
300
Besides valves what prevents back flow of blood through veins?
What is skeletal muscle, uses milking technique to push blood back towards the heart
300
What is ADH? What does it regulate?
What is antidiuretic hormone? It regulates water loss in response to drinking. Elevates blood pressure which increases urination. Secreted by the pituitary gland.
400
What are the three types of capillaries?
What is continuous, fenestrated, and sinusoids
400
What are the characteristics of fenestrated capillaries?
What is have pores in base membrane, exchange large solutes, found in choroid plexus, endocrine glands, kidneys, and intestinal tract
400
What is angiogenesis?
What is the formation of new capillary beds
400
How does resistance relate to blood flow? What is the equation?
What is inversely. Flow=change in P/R
400
Physiologically what happens to vessels during exercise?
What is increased sympathetic output, vasomotion redistribution occurs, and restricted blood flow to digestive tract
500
What are the three layers of walls of blood vessels?
What is 1) tunica intima (innermost layer) made of elastic fiber and endothelial tissue
2) Tunica media (middle layer) smooth muslce tissue only found in arteries
3) Tunica externa (outermost layer) made of elastic fibers
500
Name the path of blood through the vessels
What is arteries to arterioles to capillaries to venules to veins
500
What are venous valves made of?
What is folds of tunica intima
500
Do arteries/veins have more reabsorption/filtration? What is the net difference? Where do the leftovers go?
What is veins have more reabsorption, arteries have more filtration. Overall there is more filtration, leftovers go to the lymphatic system.
500
In what scenario does the amount of oxygen reaching the brain change?