Circulation - The Body’s Transport System The Circulatory System! (a.k.a. body transport system)

Circulation - The Body’s Transport System What is the CIRCULATORY SYSTEM? Consists of the HEART, BLOOD VESSELS, and BLOOD. A system of “roads” that links all parts of your body. The roads are really blood vessels, though…

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) to the entire body. 2)To REMOVE WASTE PRODUCTS from cells, 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 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 - The Body’s Transport System What does the HEART look like? Your HEART is the PUMP sends the blood through the system. The heart is a HOLLOW, MUSCULAR organ that pumps your blood.

Circulation - The Body’s Transport System What does the HEART look like? Each side of the heart has 2 CHAMBERS The upper chambers are called the ATRIUM chambers The lower chambers are called the VENTRICLE chambers.

Circulation - The Body’s Transport System What does the HEART look like? The ATRIA receive the incoming blood. The VENTRICLES force out the blood, sending it to the lungs or to the rest of the body.

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 - The Body’s Transport System What does the HEART look like? The RIGHT and LEFT SIDES of the heart are completely SEPARATED by a wall of TISSUE called the SEPTUM. Why is that wall so important?? [Listen up for the answer!]

Circulation - The Body’s Transport System What does the HEART look like? The ATRIA and VENTRICALS are separated by VALVES, which prevent blood from flowing in the wrong direction.

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 are very STRONG, and have THICK, muscular walls to withstand the 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 the BLOOD and the 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  Your heart is about the same size as your fist.  An average adult body contains about 5 quarts of blood.  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.  The heart circulates the body’s supply about 1,000 times each day.  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 Left Atrium Left Ventricle