Circulatory System EVERY CHILD STRONGER EVERY LIFE LONGER!

WHAT IS THE CIRCULATORY SYSTEM? The circulatory system is composed of the heart and blood vessels, including arteries, veins, and capillaries.

LET'S TALK ABOUT THE HEART The heart is the key organ in the circulatory system. As a hollow, muscular pump, its main function is to propel blood throughout the body. It usually beats from 60 to 100 times per minute, but can go much faster when necessary. It beats about 100,000 times a day, more than 30 million times per year, and about 2.5 billion times in a 70-year lifetime.

HOW DOES IT WORK? The heart has four chambers The bottom part of the heart is divided into two chambers called the right and left ventricles, which pump blood out of the heart.

ATRIUM TIME! The upper part of the heart is made up of the other two chambers of the heart, the right and left atria. The right and left atria receive the blood entering the heart.

VALVES? WHAT'S A VALVE? The tricuspid valve separates the right atrium from the right ventricle, and the mitral valve separates the left atrium and the left ventricle. The pulmonary valve and the aoritic valve allow the blood to leave the heart.

Arteries carry blood away from the heart. See here how the blood circulates throughout the body Where do you think these tissue capillaries are on the body?