7th Grade Science Terms

30 terms by plakes 

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cardiovascular system

another name for circulatory system

components of the circulatory system

heart, blood vessels, blood

job of circulatory system

carry substances to cells and waste away from cells

things that blood carries

things your body needs, waste products, and disease fighters

atrium

2 upper chambers of the heart

ventricles

2 lower chambers of the heart

valve

flap of tissue that separates the atria from the ventricles and prevents blood from flowing backwards

pacemaker

a group of cells that adjusts the heart rate

arteries

blood vessels that carry blood away from the heart

veins

vessels that carry blood back to the heart

capillaries

where substances are exchanged between the blood and body cells

first loop of circulatory system

blood travels from heart to lungs then back to heart

second loop of circulatory system

blood travels from heart to body then back to heart

aorta

largest artery in the body

diffusion

process by which molecules move from an area of high concentration to low concentration

sphygmomanometer

measure blood pressure

plasma

liquid part of blood

4 components of blood

plasma, red blood cells, white blood cells, platelets

3 jobs of plasma

controls the amount of water in blood, helps fight disease, helps form blood clots

job of red blood cells

take in oxygen from the lungs and deliver it to parts of the body

hemoglobin

the part of red blood cells that contain iron and made blood bright red

job of white blood cells

fight disease

platelets

cell fragments that help the blood clot

fibrin

forms a "net" to trap blood cells and form a clot

blood transfusion

taking blood from one person and giving it to another

lymph nodes

trap fluid left off by the capillaries and become swollen when the body fights infection

arthrosclerosis

when the walls of the artery thickens because of fat

heart attack

when blood flow to the heart is blocked

hypertension

high blood pressure

3 ways to keep you heart healthy

exercise regularly, eat a healthy and balanced diet, and avoid smoking

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