Transcript The Circulatory System

The Circulatory System
Miss Charney
Northville Central School
The
Cardiovascular/Circulatory
System’s Functions
»Carries needed products to cells
(O2, H2O, food)
»Carries wastes away from cells
(CO2, H2O, salts)
»Contains cells that fight disease
Types of Blood
»Oxygenated: blood has oxygen
(good cells - red in diagrams)
»Deoxygenated: blood does not
have oxygen (blue in
diagrams)
The Heart
» Amount of chambers in human
heart - 4 chambers
» Atrium: 2 upper chambers that
receive blood
» Ventricle: 2 lower chambers that
pump blood (ton of muscle)
» Septum: divider between the left
and right side of the heart
The Heart cont.
» Valves: flap of tissue that prevents
blood from flowing backward
(located between ventricles)
» Vena Cava: major vein leading
from the body into the heart
(superior & inferior)
» Aorta: carries blood from the left
ventricle to the body
Vessels of the Body
» Arteries: blood vessels that carry
blood away from the heart
» Structure - walls of arteries are thick (3
cell layers)
» Capillaries: materials are
exchanged between the blood and
the body’s cells
» Structure - one cell thick
» Veins: carry blood back to the heart
» Structure - 3 layers with muscle in the
middle layer (contain valves)
Blood Pressure
»Force exerted by blood against
the walls of blood vessels
»Caused by the force with which
the ventricles contract
How To Have a Healthy
Heart
»Exercise regularly
»Eat a balanced diet that is low
in saturated fats and trans
fats, cholesterol, and sodium
»Avoid smoking