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A&PII - Unit 2
Blood Vessels,
| Question | Answer |
|---|---|
| What are the 4 functions of blood vessels? | 1. Carry the blood from the heart to body tissues and back 2. Allow substances to be exchanged between blood and body cells 3. Regulate the amount of blood delivered to specific tissues 4. Help regulate blood pressure |
| 3 main types of blood vessels? | 1. Artery 2. Vein 3. Capillary |
| What makes up the vessel wall (except capillaries and some venules) | From inner to outer : tunica intima, tunica media, tunica externa |
| What is the tunica intima? | inner most layer of vessels, a basement membrane and connective tissue |
| What is the tunica intima made of? | simple squamous endothelium |
| What is the tunica media? | middle layer of vessels |
| What is the tunica media made of? | circular smooth muscle & elastic and collagen fibers |
| What is the tunica externa? | outermost layer of blood vessels |
| What is the tunica externa made of? | transitions from dense to loose connective tissue (going outward) |
| Arteries carry blood : (to or away from the heart?) | away from the heart |
| Veins carry blood : (to or away from the heart?) | to the heart |
| Which type of blood vessel has thick strong walls that conduct blood under high pressure? | arteries |
| As this type of blood vessel branches, they become smaller with less elastic tissue and more smooth muscle. | Arteries |
| arteries: ______ ________ arteries expand during ______ and recoil during _______. | Large, elastic ; systole ; diastole |
| arteries: Large elastic arteries expand during systole, which reduces ______ ________ while receiving a high blood volume. | blood pressure while receiving a high blood volume |
| arteries: Large elastic arteries recoil during diastole, which maintains : | blood pressure |
| arteries: medium sized ______ _________ are thick with smooth muscle. | muscular arteries |
| arteries: muscular arteries controls flow by : | vasoconstriction and vasodilation |
| arteries: these control flow into capillaries : | small arterioles |
| This type of blood vessel supplies the capillaries with blood : | arteries |
| This type of blood vessel facilitates exchange between blood and interstitial fluid : | capillaries |
| This type of blood vessel is made of thin walls (simple squamous epithelial) and conducts slow blood flow : | capillaries |
| simple squamous epithelial is good for : | diffusion |
| Capillaries branch without changing diameter to form : | capillary beds |
| These regulate flow into the capillaries : | pre capillary sphincters |
| These allow blood to bypass capillary beds : | thoroughfare channels |
| The movement between capillaries and interstitial fluid is called : | capillary exchange |
| What am I ? - occurs through or between the endothelial cells - occurs by diffusion, osmosis, or filtration - some fluid is lost to tissues, and is later recovered by the lymphatic system | capillary exchange |
| This blood vessel has thinner walls an a larger lumen to return blood under lower pressure : | Veins |
| this type of blood vessel is thinner than arteries because it doesn't have as much smooth muscle or elastic tissue : | veins |
| As this type of blood vessel merges, they become larger with thicker walls : | veins |
| Many veins have these to prevent back flow : | valves |
| valves are necessary in veins because : | the low pressure |
| venous return is aided by 3 things, what are they? | 1. skeletal muscle pump 2. respiratory pump 3. sympathetic venoconstriction |
| function of skeletal muscle pump : | contraction compresses veins |
| function of respiratory pump : | inhalation decreases thoracic pressure |
| function of sympathetic venoconstriction : | constriction reduces venous volume |
| Term for the point where two blood vessels merge : | anastomoses |
| This happens when your small blood vessels leak fluid into nearby tissues, causing swelling : | edema |
| These are swollen, twisted veins that you can see just under the skin, usually in the legs and feet : | varicose veins |
Created by:
cmmleko
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