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Circulatory System - 7th Grade Brawley Middle

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Jill Hoffman

on 18 February 2014

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Transcript of Circulatory System - 7th Grade Brawley Middle

Circulatory System
Works Well with Others
transports materials from digestive & respiratory systems to cells
Uses blood because:
1. moves continuously
2. delivers oxygen and other materials to cells
3. removes carbon dioxide and wastes from cells
pushes blood through circulatory system
right side = pumps blood to lungs = receives oxygen
left side = pumps blood to body
right atrium -
receives oxygen poor blood from body
right ventricle -
pumps oxygen poor blood to lungs
left atrium -
receives oxygen rich blood from lungs
left ventricle -
pumps oxygen rich blood from lungs
made of:
red blood cells
white blood cells
60% plasma contains:
other substances in H2O
white blood cells help:
fight infection
attack disease-causing organisms
red blood cells pick up:
oxygen in lungs
transport oxygen throughout body
platelets are:
large cell fragments
help form blood clots
rescue injured blood vessels
Blood Vessels
take blood AWAY from heart
have strong walls
carry blood back to heart
wall thinner than artery walls
larger diameter than arteries
Pulmonary blood vessels:
arteries: carry oxygen poor blood to each lung.
veins: carry oxygen rich blood from lungs to heart.
very narrow
connect arteries to veins
materials exchanged here between blood & tissues
Blood Exerts Pressure
definition: force produced when heart contractions travel through blood, putting pressure on blood vessel walls.
too low = some cells won't get oxygen & other materials
too high = force may weaken the blood vessels & require heart to work harder
measured with a sphygmomanometer
How to read:
two numbers (one over another)
first = the pressure in arteries when heart contracts
second = the pressure in arteries when heart relaxes & receives blood from veins
Blood Typing
Four Types:
type A
type B
type AB
type O
Type A = has A proteins (antigens) on surface
Type B = has B proteins (antigens) on surface
Type AB = has both A and B proteins (antigens) on surface
Type O = has NO proteins (antigens) on surface
for blood transfusions you should receive same blood as your type because your body has a natural protection system (immune system) that will attack things that are not like itself.
Google Images: Human Heart (dissection)
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