Circulatory System
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What are the 3 types of blood vessels | show 🗑
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show | Carry blood away from the heart to tissues. Delivers to capillary beds for gas, nutrient, and waste exchange. Thick walls that withstand high BP. NO VALVES. (15% of blood volume) (blood flow is slower)
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Capillaries function, location, type of tissue, what layers does it have | show 🗑
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show | Carry blood from tissues back to the heart. Thin, non-elastic, walls that can't withstand much pressure, but thicker than arteries. CONTAIN VALVES. (60% of volume at rest)
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What are the three layers in the vessel walls from deep to superficial | show 🗑
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show | Deepest layer, includes endothelial simple squamous lining, basement membrane , sparse layer of loose CT. Also has a thick layer on outer margin, internal elastic membrane (only arteries)
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show | Middle layer, sheets of smooth muscle in loose CT.
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show | Outer layer,anchors vessel to adjacent tissues. In large veins and arteries it contains Vasa vasorum (blood supply for large vessels)
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show | Elastic (conducting/large), Muscular (distributing/medium), and Arterioles (small)
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show | Tunica media: many elastic fibers, few muscle cells. Contains Vasa Vasorum. Ex: pulmonary trunk, aorta, common carotid, subclavian, common iliac
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Vasa Vasorum | show 🗑
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Muscular (distributing/medium) arteries | show 🗑
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Arterioles | show 🗑
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show | Continuous, fenestrated, and sinusoid
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Continuous capillaries | show 🗑
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Fenestrated Capillaries | show 🗑
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Sinusoid Capillaries | show 🗑
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show | 1. Venules, 2. Medium, and 3. Large
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show | Smallest veins that carry blood away from capillaries
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show | Thin tunica media (few muscle cells.) Thin tunica externa (horizontal bundles of elastic fibers.) Contains valves. EX: Radial, Ulnar, small/great saphenous
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Large sized veins | show 🗑
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Hepatic portal circulation | show 🗑
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BP definition | show 🗑
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What is BP measured in | show 🗑
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Systolic pressure | show 🗑
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show | Minimum pressure exerted on blood vessel walls (second # in BP reading)
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Hemodynamics | show 🗑
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show | Twisted, dilated, superficial veins. Cause by leaking of valves of veins. Help with blackflow and pooling of blood.
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What is the most common circulatory route | show 🗑
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show | Blood flows through 2 consecutive capillary networks before returning to heart -3 total in body - (hypothalamus/anterior pituitary, kidneys, intestine/liver)
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Why can't we have artery anastomoses all over our body like in the brain/heart | show 🗑
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show | "Blood Hydrostatic pressure" - Pressure exerted by the pumping of your heart which drives fluid OUT of the capillaries (high on arterial end, low on venous end)
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show | "Blood colloid osmotic pressure" - A form of osmotic pressure exerted by plasma proteins (albumins) that pulls fluids INTO capillaries (same on arterial and venous ends)
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Where are plasma proteins produced | show 🗑
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IFHP | show 🗑
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show | "Interstitial fluid osmotic pressure " - A form of osmotic pressure in the interstitial fluid that drives the fluid out of the capillaries (but is very low compared to BCOP and BHP)
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NFP equation | show 🗑
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show | Filtration
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What do venous pressures promote in capillary exchange | show 🗑
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To calculate the Net Hydrostatic Pressure along the whole capillary what do you do | show 🗑
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show | Interstitial fluid and plasma proteins are collected by lymphatic capillaries (about 3 liters a day)
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Diffusion in capillary exchange | show 🗑
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Transcytosis in capillary exchange | show 🗑
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show | Movement of bulk flow in large amounts, move in response to pressure, high -> low, faster than diffusion
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Consequences of edema | show 🗑
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show | Faster/veins
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What is venous return dependent on | show 🗑
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show | Longer/friction/increases
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___ miles of vessels for 1 pound of _____ | show 🗑
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Why do longer vessels produce higher BP | show 🗑
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show | You will have increase in friction, decrease of flow resulting in increase in BP (dehydration & polycythemia)
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show | The smaller the radius the more friction and resistance. The average velocity of blood flow will also be lower and slower (fluctuations in BP)
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What controls BP by changing its diameter | show 🗑
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What are 3 reasons the blood flow from the aorta to the capillaries decreases | show 🗑
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What are 2 reasons the blood flow from the capillaries to the vena cava increases | show 🗑
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The skeletal muscle pump process | show 🗑
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Thoracic pump | show 🗑
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Venous pooling (vascular shock) can cause | show 🗑
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show | Pro-hormone released by liver which stimulates the release of Renin (kidney enzyme for low BP) and they together activate angiotensin 1
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show | ACE (angiotensin-converting enzyme in lungs, which blocks the enzyme lowering BP) converts angiotensin 1 into angiotensin 2
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show | Very potent vasoconstrictor, derives from angiotensin 1
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show | Angiotensin, aldosterone, ADH, Epinephrine & norepinephrine, atrial natiruretic factor
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show | Increase urinary sodium excretion for generalized vasodilation (raise BP)
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Aldosterone and BP | show 🗑
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ADH and BP | show 🗑
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