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April 8 Test
For my sci test
Question | Answer |
---|---|
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 |