The Circulatory System -...

Circulation - The Body’s Transport System

The Circulatory System:

The Body’s Transport System

Circulation - The Body’s Transport System

The Circulatory

System!

Circulation - The Body’s Transport System

What is the CIRCULATORY SYSTEM?

• A “HIGHWAY” NETWORK that LINKS all parts of your body.

• Consists of the HEART, BLOOD VESSELS, and BLOOD.

Circulation - The Body’s Transport System

What is the FUNCTION of the circulatory system?

1) To DELIVER NEEDED SUBSTANCES TO CELLS. (ex. oxygen and glucose)

2) To REMOVE WASTE PRODUCTS, carrying them AWAY from cells.

3) To FIGHT DISEASE by carrying white blood cells to source of disease.

Circulation - The Body’s Transport System

How does the circulatory system work?

•  The HEART is the PUMP that makes it work.

•  Each time the HEART BEATS, it PUSHES BLOOD through the BLOOD VESSELS of the circulatory system.

Circulation - The Body’s Transport System

What does the HEART look like? •  The heart is a HOLLOW,

MUSCULAR organ that pumps your blood.

•  The RIGHT and LEFT SIDES of the heart are completely SEPARATED by a wall of tissue called the SEPTUM.

Circulation - The Body’s Transport System

What does the HEART look like? •  Each side of the heart

has 2 CHAMBERS (4 all together).

•  The upper chamber is called an ATRIUM.

•  The lower chamber is called a VENTRICLE.

Circulation - The Body’s Transport System

What does the HEART look like? •  VALVES SEPARATE the

chambers and prevent blood from FLOWING in the WRONG DIRECTION.

Circulation - The Body’s Transport System

How does the HEART pump? •  When the strong MUSCLES

around the VENTRICLES contract, they exert a FORCE on the blood.

•  This force PUSHES the blood OUT of the heart INTO THE ARTERIES.

Circulation

Circulation - The Body’s Transport System

Where does the blood go after it leaves the HEART?

•  After leaving the heart, the blood travels in TWO LOOPS.

•  The LOOPS are the CIRCLE

part of the CIRCULATORY system.

Circulation - The Body’s Transport System

Where does the blood go after it leaves the HEART? •  In the FIRST LOOP, blood

travels from the HEART TO THE LUNGS AND BACK.

•  At the LUNGS, the blood gets RID OF CARBON DIOXIDE and PICKS UP OXYGEN.

Circulation - The Body’s Transport System

Where does the blood go after it leaves the HEART? •  In the SECOND LOOP, blood

travels from the HEART OUT TO THE BODY AND BACK.

•  After the first loop, the blood is OXYGEN-RICH and DELIVERS OXYGEN out to the body where it is USED BY MUSCLES.

Circulation

Why is it important that

the septum separates the left and right sides of the

heart?

Circulation - A Closer Look at Blood Vessels

What are BLOOD VESSELS?

•  BLOOD VESSELS are the HOLLOW TUBES that carry your blood around your body.

•  There are 3 TYPES: 1) ARTERIES 2) CAPILLARIES 3) VEINS

Circulation - A Closer Look at Blood Vessels

What are ARTERIES?

•  ARTERIES carry blood AWAY FROM THE HEART.

•  They have THICK, MUSCULAR walls that are STRONG and FLEXIBLE and can stand the enormous PRESSURE created by the heart.

Circulation - A Closer Look at Blood Vessels

What are CAPILLARIES? •  CAPILLARIES are TINY

vessels that run all through your BODY’S TISSUE.

•  The WALLS are very THIN to allow OXYGEN and WASTES to be exchanged between BLOOD and CELLS.

Circulation - A Closer Look at Blood Vessels

What are VEINS? •  VEINS carry blood

BACK TO THE HEART.

•  They have THINNER WALLS than arteries do, because there is much LESS PRESSURE from the heart.

Circulation - A Closer Look at Blood Vessels

Circulation - A Closer Look at Blood Vessels

Amazing Heart Facts Ø  Your heart is about the same size as your fist. Ø  An average adult body contains about 5 quarts of

blood. Ø  All the blood vessels in the body joined end to end

would stretch 62,000 miles or two and a half times around the earth.

Ø  The heart circulates the body’s supply about 1,000 times each day.

Ø  The heart pumps the equivalent of 5,000 to 6,000 quarts of blood each day.

“Flow chart” of Blood Flow •  From Body

•  Right Atrium

•  Right Ventricle

•  To Lungs

•  From Lungs

•  Left Atrium

•  Left Ventricle

•  To Body http://www.smm.org/heart/heart/pumping-f.htm

Circulation - Blood

Circulation - Blood