Chapter 12 And 13 Heart And Cardiovascular Flashcards

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0
Q

What are the four chambers

A

-2 upper chambers called atria:receiving chambers:blood pumped
In
-2 lower chambers called ventricles:discharging chambers: blood
pumped out

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1
Q

What is the structure of the heart

A
  • The hollow organ composed of cardiac muscle tissue called myocardium
  • covered with a loose fibrous sac called pericardium
  • each side of the heart is divided onto two chambers(total of 4)
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2
Q

What do valves do

A
  • Valves control the direction of blood flow

- open and close in response to pressure changes as the heart squeezes(systole) and relaxes(diastole)

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3
Q

What are the types of valves

A
  • Atrioventricular valves: between atria and ventricles
  • left side: bicuspid or mitral valve
  • right side: tricuspid valve
  • semilunar valve
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4
Q

What are semilunar valves

A

-they are between the ventricles and the large vessels that carry
blood away from the heart
-aortic SL valve on the left and pulmonary SL valve on the right

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5
Q

What are the types of vessels

A

-arteries carry blood away from the heart
-veins carry blood toward the heart
-capillaries are tiny vessels where exchange of gases, and
nutrients and waste products takes place

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