CARDIOVASCULAR SYSTEM: PART II

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CARDIOVASCULAR SYSTEM PART II

• CIRCULATION

Mr. Carlin
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Blood Flow

• Blood enters the heart from the body in the
  superior and inferior venae cavae.
• Blood from the walls of the heart goes through
  the coronary sinus into the RIGHT ATRIUM.
• This is de-oxygenated blood!

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Blood Flow in Heart

• The deoxygenated blood goes through the a
  three-cuspid valve, the TRICUSPID valve into the
  RIGHT VENTRICLE.
• It is pumped into pulmonary arteries to pick up
  oxygen in the lungs.

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• The blood returns to the heart in the pulmonary
  veins.
• It enters the LEFT ATRIUM.
• This is oxygenated blood!

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• Atria open into ventricles.
• Blood passes through Atrio-ventricular canals.
• Valves prevent the blood from flowing backwards.

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Coronary Blood Flow
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• Blood passes through the MITRAL OR BICUSPID VALVE
  into the thick-walled LEFT VENTRICLE.
• Muscular contraction pumps blood through the
  semilunar valves into the AORTA and throughout
  the body.

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• An interventricular septum divides the 2
  ventricles.

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Question

• Why is the left ventricle thicker than the right
  ventricle?

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Answer

• More force is required for contraction to pump
  blood throughout the body.

Heart Diagram
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Review

• Trace the blood through the heart