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

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


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

NORMAL HUMAN HEART

The tissues and structures of the heart make it an efficient pump.
  • Cardiac muscle tissue works continuously without tiring.
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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.
slide4

SA node

VA node

  • The heartbeat consists of two contractions.
  • SA node, or pacemaker, stimulates atria to contract
  • AV node stimulates ventricles to contract
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1

3

2

4

  • Blood flows through the heart in a specific pathway.
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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
the heart pumps blood through two main pathways
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
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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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