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April 8 Test

For my sci test

What are the three components of the circulatory system? heart, blood vessels, blood
What is the main goal of the circulatory system? To get food and oxygen to cells and wastes and oxygen from cells
What are the 3 types of blood vessels? artery, vein, capillary
Describe an artery? Carries blood AWAY from the heart High in oxygen Thick, smooth muscle pumps the blood = PULSE HIGH pressure
Describe a vein? Carries blood TO the heart Low in oxygen Thin, smooth layer Valves to stop the backflow of blood LOWER pressure
Describe capillaries? Carries blood from small arteries to small veins Wall is 1 cell thick Diffusion occurs food and O2 delivered CO2 and wastes are picked up from cells VERY LOW pressure - blood cells go through 1 at a time Helps control body heat
What is hypertension? Describe and etc. HIGH blood pressure B.P. = force of blood on inside walls of arteries High b.p. can damage blood vessels and make heart work harder Exercise, low salt diet and weight control help control high b.p.
What are the components of blood? Define blood using these components. A connective tissue made up of plasma, red blood cells, white blood cells, and platelets
What is plasma? describe. The liquid part of blood Makes up 55% of blood Plasma is 92% water Carries soluble nutrients, enzymes, and wastes
What is a rbc? Describe it. Most numerous cell in blood - 5 million/mL Contains hemoglobin - iron protein that chemically combines with oxygen and carries it Made in bone marrow Live 120 days Have NO nucleus Dead ones are removed by the liver and spleen
What is a wbc? Describe it. Have about 7,000/mL if healthy RBC 700:1 WBC Made in bone marrow and lymph nodes Have a nucleus and live many years Kill invaders by eating them Make antibodies, which also fight invaders
What is a platelet? Describe it. Cell fragments Last about 10 days Main function is to form clots When you get cut - the platelets collect around broken blood vessels, release an enzyme called FIBRIN (fiber) This forms a net and traps RBC’s and stops bleeding Clot dries = scab
What are the four main blood types? A, B, AB, O
Define the term "blood transfusion." transfer of blood from one person (donor) to another (recipient)
Who/what is the universal donor? Type O-
Who or what is the universal receiver? Type AB +
Define "blood pressure." . Force exerted by blood on the inside walls of arteries
Define "Systolic pressure". pressure when ventricles contract
Define "Diastolic pressure" pressure when ventricles relax
How does blood regulate body temperature? Regulated by opening and closing of blood vessels in your skin to lose or conserve heat Also, is controlled by the brain
Created by: zippazap