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  4. The circulatory system
  5. Mammalian heart and blood vessels

40.3 Mammalian heart and blood vessels  (Page 9/41)

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  • Card 9 / 41:
    Describe the cardiac cycle.

    The heart receives an electrical signal from the sinoatrial node triggering the cardiac muscle cells in the atria to contract. The signal pauses at the atrioventricular node before spreading to the walls of the ventricles so the blood is pumped through the body. This is the systolic phase. The heart then relaxes in the diastole and fills again with blood.

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Source:  OpenStax, Biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11448/1.10
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