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A&P Ch. 19

Cardiovascular System & Blood Vessels

Three Major Types of Blood Vessels? Arteries, Veins, & Capillaries
What do Capillaries do? Point of Exchange between blood and tissues
What is the Tunica Interna? Simple Squamous epithelium, Lines inner most layer of vessel.
What is the Tunica Media? Smooth muscle layer, controld vasoconsriction and vasodilation.
What is the Tunica Externa? Outer most layer of vessel, made up of collegen fibers for support and reinforcement.
What are charecteristics of arteries? Carry blood away from the heart, have thicker wall than veins, Active in vaso dilation and constriction, higher pressure than veins, smallest arteries are atrioles.
What are charecteristics of capillaries? Smallest of the blood vessels, allow diffusion in and out of blood, allow only a single RBC to pass at a time, thin tunica interna
Where does filtration occur? At atriole end, blood pressure causes flud to flow out of capillaries into the interstitial space.
Where does reabsorbtion occur? At venule end, osmotic pressure causes fluid to flow back into capillaries
What are charecteristics of veins? Much lower BP, thinner walls, large diameter, smallest veins are venules, valves prevent backflow, Muscles assist w/ vaso return, not active in dilation & constriction
Name order of vessel flow starting from the heart. Heart, Arteries, Arterioles, Capillaries, Tissues, Capillaries, Vunules, Veins
T/F- Blood pressure increases with distance from the heart. False, it decreases
Name 4 factors that effect blood pressure. Heart rate/force, Blood volume, Peripheral resistance, Viscosity of blood
What is Hypotension? Systolic BP below 100 mm Hg.
What is hypertension? Sustained arterial pressure of 140/90 or higher, Chronic elevation can result in heart failure, vascular disease, renal failure, and stroke
What is orthostatic hypotension? Temporary low BP and dizziness when suddenly rising from a sitting/recling position.
What is chronic hypotension? From poor nutrition or a warning sign for Addison's disease (not enough cortisol)
What is acute hypotension? Important sign of ciculatory shock, threat to surgery and intensive care patients.
What is Arteriosclerosis? "Hardening" of arteries, arteries lose elasticity
What is Atherosclerosis? Plaque build-up in arteris that decreases or blocks blood flow
What are Varicose veins? Weakened veins that swell and bulge
What is circulatory shock? Inadequate blood flow to meet tissue needs
What is Hypovolemic shock? Type of circulatory shock resulting from large-scale blood loss
What is vascular shock? Type of circulatory shock resulting from extreme vasodilation
Condition which heart cannot sustain adequate circulation Cardiogenic shock
Created by: Joshdole04



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