Biology Chapter 23-1

Biology Chapter 23-1 - 1 Chapter 23 Section 1 The...

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Section 1 – The Cardiovascular System circulatory system – made of the heart, blood, vessels, and the lymphatic system. cardiovascular system – made of the heart and 3 types of vessels. “cardio” – Greek for heart “vascular” – blood vessel Heart about the size of your fist. found almost in the center of your chest. divided into a right side and left side. right side – pumps oxygen-poor blood to lungs. left side – pumps oxygen-rich blood to the body Each side has an upper chamber and a lower chamber. The upper chambers are called atrium . (atria) The lower chambers are called ventricles . When the atria contract, blood is squeezed into the ventricles. When the atria relax, the ventricles contract and push blood out of the heart. Blood from the right ventricle goes to the lungs. Blood from the left ventricle goes to the rest of the body. Blood Vessels Blood travels throughout your body in hollow tubes called blood vessels. The three types of vessels are:
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Biology Chapter 23-1 - 1 Chapter 23 Section 1 The...

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