The tissues and structures of the heart make it an efficient pump.

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Cardiovascular System

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Presentation transcript:

KEY CONCEPT The heart is a muscular pump that moves the blood through two pathways.

The tissues and structures of the heart make it an efficient pump. Cardiac muscle tissue works continuously without tiring. NORMAL HUMAN HEART

The heart has four chambers: two atria, two ventricles. Valves in each chamber prevent backflow of blood. aortic valve left atrium mitral valve left ventricle septum pulmonary valve right atrium tricuspid right ventricle Muscles squeeze the chambers in a powerful pumping action.

The heartbeat consists of two contractions. SA node, or pacemaker, stimulates atria to contract AV node stimulates ventricles to contract SA node VA node

Blood flows through the heart in a specific pathway. 3 1 4 2

Blood flows through the heart in a specific pathway. oxygen-poor blood enters right atrium, then right ventricle right ventricle pumps blood to lungs oxygen-rich blood from lungs enters left atrium, then left ventricle left ventricle pumps blood to body

The heart pumps blood through two main pathways. Pulmonary circulation occurs between the heart and the lungs. oxygen-poor blood enters lungs excess carbon dioxide and water expelled blood picks up oxygen oxygen-rich blood returns to heart

Systemic circulation occurs between the heart and the rest of the body. oxygen-rich blood goes to organs, extremities oxygen-poor blood returns to heart The two pathways help maintain a stable body temperature.