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30 terms

7th Grade Science Terms

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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