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21 Cards in this Set
- Front
- Back
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Blood Vessel Walls |
-Tunica Intima - innermost layer -Tunica Media - binds to inner and outer layer - Tunica Externa - anchors vessels to tissue |
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Artery appearance |
- usually round with thicker wall -tunica intima is usually ripples die to vessel constriction -has internal and external elastic membrane -tunica externa has collagen and eleastic fibers
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Vein appearance |
-usually flattened, with thin wall -NO internal or external elastic membranes -tunica externa has collagen, elastic fibers, and smooth muscle cells |
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Artery and Vein differences |
Arteries -have thickeer walls -higher BP -small, round lumen -lining folds -more elastic
Veins -large, flat lumens -vein lining contracts -have valves |
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Capillaries |
-smallest vessels with thin walls (noo tunica media or tunica externa)
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Continuous Capillaries |
-permit diffusion of water, small solutes, and lipid soluable materials -block blood and plasma from leaving capillaries
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Fenestrated Capillaries |
-have pores -permit rapid exchange
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Sinusoidal Capillaries |
-have gaps between adjacent endothelial cells -permit free exchange
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Precapillary Sphincter |
guard entrance to each capillary and opens and closes cause capillary blood to flow in pulses |
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Arterial Anastomosis |
fusion of two arteries |
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Angiogenesis |
formation of new blood vessels |
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Systolic Pressure |
Peak arterial pressure during ventricular systole |
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Diastolic Pressure |
Minimum arterial pressure during ventricular diastole |
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Autoregulation |
causes immediate localized homeostatic adjustments |
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Carotid Sinuses |
maintain blood flow to brain |
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Aortic sinuses |
monitor start of systemic circuit |
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ADH is released in response to.... |
-falling BP -falling blood volume -ADH increases blood volume and vasoconstriction |
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Angiotenison II stimulates |
-cardiac output and vasoconstriction -ADH production -Thirst |
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EPO (erythropoiten) stimulates |
-RBC production |
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Atrial Natiuretic Peptide (ANP) |
produced by cells in R atrium in response to excessive atrial stretching during diastole |
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Brain Natiuretic Peptide (BNP) |
produced by ventricular muscle cells in response to excessive ventricular stretching during diastole |
