THE CIRCULATORY SYSTEM

By Yasheeka Patel, Amelia Norris, Lisa Ostman, Joyce Liu, Monica Macinante, Pabodha Gunaratne

FUNCTION:• The Circulatory System is an

organ system that allows blood to circulate and transport nutrients, oxygen, carbon dioxide, hormones, blood cells, and more.

• It allows blood to and from cells in the body to the entire body. nourish it, help fight disease and stabilize body temperature.

THREE MAJOR PARTS: The Heart The Blood The Blood Vessels

HEART:The heart is a hollow, muscular organ, located in the centre of your chest.

Roughly the size of a human fist, the heart is the centre of your body's circulatory system, and it performs 2 important functions:

• supplying oxygenated blood to your body

• helping rid the body of waste products, such as carbon dioxide.

BLOOD VESSELS:•Arteries

•Capillaries

•Veins

ARTERIES:

Arteries are blood vessels that carry oxygen rich blood AWAY from the heart.

CAPILLARIES:

Capillaries are tiny blood vessels are thinner than hair. Capillaries connect arteries to veins. Nutrients, oxygen and wastes pass in and out of your blood through the capillary walls.

VEINS:

Veins carry blood back toward your

heart.

BLOOD: The blood is constantly flowing through our

bodies. Blood is pumped by our heart. Blood travels through thousands of miles of

blood vessels within the body. Blood carries nutrients, water, oxygen and

waste products to and from body cells. A young person has about a gallon of blood.

An adult has about 5 quarts. Blood is not just a red liquid but rather is

made up of liquids, solids and small amounts of oxygen and carbon dioxide.

BLOOD CELLS:RED BLOOD CELLS:

• Red Blood Cells are responsible for carrying oxygen and carbon dioxide.

• Red Blood Cells pick up oxygen in the lungs and transport it to all the body cells.

• There are about 5,000,000 Red Blood Cells in ONE drop of blood.

WHITE BLOOD CELLS (Germinators):• White Blood Cells help the body fight off germs. • White Blood Cells attack and destroy germs when they enter the

body. • Sometimes our White Blood Cells need a little help and the

Doctor will prescribe an antibiotic to help our White Blood Cells fight a large scale infection.

BLOOD CELLS:PLATELE

• Platelets are blood cells that help stop bleeding.

• In order to plug up the holes caused when we get cut, the platelets start to stick to the opening of the damaged blood vessels.

• As the platelets stick to the opening of the damaged vessel they attract more platelets, fibers and other blood cells to help form a plug to seal the broken blood vessel.

• We call our platelet plugs scabs.

PLASMA:

• Plasma is the liquid part of the blood. Approximately half of our blood is made of plasma.

• The plasma carries the blood cells and other components throughout the body.

• Plasma is made in the liver.

INTERESTING FACTS:• The heart beats around 3 billion times in the average person's life. 

• About 8 million blood cells die in the human body every second, and the same number are born each second. 

• Within a tiny droplet of blood, there are some 5 million red blood cells. 

• It takes about 20 seconds for a red blood cell to circle the whole body. 

• Red blood cells may live for about 4 months circulating throughout the body, feeding the 60 trillion other body cells 

• The blood travels in veins back to the right side of the heart, where it is pumped directly to the lungs. 

THANK YOU FOR WATCHING!