Circulatory System

COOL FACTS……. The body of an adult contains over 60,000 miles of blood vessels! Strung together end to end, your blood vessels could circle the globe 2 1/2 times! An adult's heart pumps nearly 4000 gallons of blood each day! Your heart beats some 30 million times a year!

What is it? Read page 413-1st paragraph on 415 Define: Circulatory system It is made up of three things: The Heart The Blood Vessels The Blood The circulatory system is the body’s delivery system. Delivers Oxygen and removes wastes!

Your Heart…. How big? Located? How many times a minute does it beat? About the size of your fist Located? In the center of your chest under your sternum How many times a minute does it beat? Count your heartbeat for 10 seconds and multiply by 6

The Heart….. The right and left sides of the heart are divided by a wall called the: Septum The septum prevents : the mixing of oxygen rich blood and oxygen poor blood

The Heart…. On each side of the septum are two chambers The upper chamber is called the atrium. It receives blood The lower chamber is called the ventricle. It pumps out blood.

How does blood flow through the heart? “BLUE SIDE” 1 Deoxygenated blood (low on oxygen) Wants to get to the lungs 2 Goes to the RIGHT atrium And the RIGHT Ventricle 3 Goes to the lungs Picks up the oxygen Deoxygenated blood passes from right atrium into right ventricle and then goes to the lungs to pick up oxygen. 1 3 2 2

How does blood flow through the heart? “RED SIDE” From the lungs, the oxygenated blood goes back to the heart to the left atrium and then the left ventricle and then pumped to the rest of the body. 1 The blood has become oxygenated Coming from the lungs 2 Goes back to the heart to LEFT atrium Then LEFT ventricle 3 The blood (with oxygen) is pumped to the body The body uses up the oxygen and the process starts over 3 1 2 2

Flaps of connective tissue, called VALVES, are located between the atria and ventricles When blood is flowing the values are open When the ventricles contract, the valves close to stop blood from going back into the atria This system of valves keeps blood flowing in one direction circulation video

What is blood made of? READ page 415 Made of equal parts of solids and liquids The liquid part of blood is called: Plasma (mostly water) The solid parts are blood cells Red blood cells White blood cells Platelets

Red Blood Cells Red Blood Cells: Most numerous type Transport oxygen Disk shaped Made in the bone marrow

White Blood Cells White Blood Cells: Guard against infection and attack bacteria When fighting, the number of WBC in your body increases

Platelets Platelets Aid the body in blood clotting Too low-excessive bleeding Too high-blood clots blood cells video

Blood Vessels- 3 types Arteries Veins Capillaries ARTERIES: Carry blood Away from heart to other parts of the body VEINS: Carry blood from the body back to the heart CAPILLARIES Tiny blood vessels that connect veins and arties to the body’s cells (gases are exchanged)

Problems of the Circulatory system READ Pages 416 & 417 & Define: Hypertension: high blood pressure Heart attack: blockage of blood flow to the heart Stroke: results from blood clots that block vessels in the brain, or a rupture of a blood vessel Arteriosclerosis: condition in which arteries harden, reducing the amount of blood that can flow through them Anemia: abnormally low level of hemoglobin, a protein that binds to oxygen in red blood cells Leukemia: type of cancer in which large amounts of abnormal white blood cells are produced which interferes with the production of other blood cells

Clogged Arteries

Care of the Circulatory System Get 60 minutes of activity on most days Limit the amount of fat in your eating plan; especially saturated fat Increase fiber Avoid tobacco Manage stress