For my sci test
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What are the three components of the circulatory system? | heart, blood vessels, blood
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| What is the main goal of the circulatory system? | To get food and oxygen to cells and wastes and oxygen from cells
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| What are the 3 types of blood vessels? | artery, vein, capillary
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| Describe an artery? | Carries blood AWAY from the heart
High in oxygen
Thick, smooth muscle pumps the blood = PULSE
HIGH pressure
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| Describe a vein? | Carries blood TO the heart
Low in oxygen
Thin, smooth layer
Valves to stop the backflow of blood
LOWER pressure
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| 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
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| 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.
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| 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
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| What is plasma? describe. | The liquid part of blood
Makes up 55% of blood
Plasma is 92% water
Carries soluble nutrients, enzymes, and wastes
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| 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
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| 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
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| 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
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| What are the four main blood types? | A, B, AB, O
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| Define the term "blood transfusion." | transfer of blood from one person (donor) to another (recipient)
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| Who/what is the universal donor? | Type O-
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| Who or what is the universal receiver? | Type AB +
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| Define "blood pressure." . | Force exerted by blood on the inside walls of arteries
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| Define "Systolic pressure". | pressure when ventricles contract
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| Define "Diastolic pressure" | pressure when ventricles relax
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| 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
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