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A&PII - Unit 2

Blood Vessels,

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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