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

KEY CONCEPT The heart is a muscular pump that moves the blood through two pathways. NORMAL HUMAN HEART. The tissues and structures of the heart make it an efficient pump. Cardiac muscle tissue works continuously without tiring. pulmonary valve. aortic valve. left atrium. right atrium.

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

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

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

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

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

  5. 1 3 2 4 • Blood flows through the heart in a specific pathway.

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

  7. 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 waterexpelled • blood picks up oxygen • oxygen-rich blood returns to heart

  8. 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.

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