Chapter 12 And 13 Heart And Cardiovascular

Question 0

What are the four chambers

Answer 0

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

Question 1

What is the structure of the heart

Answer 1

• 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)

Question 2

What do valves do

Answer 2

• Valves control the direction of blood flow

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

Question 3

What are the types of valves

Answer 3

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

Question 4

What are semilunar valves

Answer 4

-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

Question 5

What are the types of vessels

Answer 5

-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