Anatomy Heart Quiz 2
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Created by:
tecsonaleeza on February 23, 2012
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33 terms
Terms | Definitions |
|---|---|
 sinoatrial node; atrioventricular node; atriaventricular bundle; bundle branches; purkinjie fibers | 5 parts of the intrinsic conduction system |
| systole | ventricular contraction |
| diastole | ventricular relaxation |
| cardiac cycle | one complete heart beat |
| heart sounds | "lub" closing of AV valves; "dub" closing of semilunar valves |
| cardiac output | amount of blood pumped out by each side of the heart in 1 minute |
| stroke volume | volume of blood pumped out by a ventricle by a ventricle w/ a heartbeat |
| smaller arteries | large arteries divide into - - |
| arterioles | smallers arteries divide into - |
| capillary beds | arterioles feed into - - |
| venules | capillary beds are drained by - |
| vena cava | largest veins |
| vena cava | returns blood into the right atrium |
| arteries | always carry blood away from the heart |
| veins | always carry blood toward the heart |
| capillaries | the only sites where only gas/ nutrient exchange can occur in tissues |
| 3 | # of coats or tunics |
| tunica intima | lines inside of the vessels |
| tunica intima | squamos epithelial |
| tunica intima | cells are loose |
| tunica intima | slick surface to reduce friction |
| tunica media | middle layer |
| tunica media | smooth muscle |
| tunica media | changes blood pressure as vessels constrict or dilate |
| tunica externa | outer layer |
| tunica externa | fibrous connective tissue |
| tunica externa | supports and protects |
| arteries | which walls are thicker arteries or veins? |
| arteries have to be able to expand to accomondate force of blood | why? |
| vein | which insides are larger veins or arteries? |
| the amount of blood returning to heart is equal to amount being pumped out | why? |
| veins | have valves to prevent blood flow |
| capillaries | walls of - are one cell layer thick due to exchange functions |
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