Heart Cardiac Cycle (04)

Question 1

Systole

Answer 1

repetitive contraction of heart chambers, ejects blood

Question 2

Diastole

Answer 2

relaxation of heart chambers, fill with blood,

Question 3

Blood moves through circulatory system from areas of
_____ to _____ pressure

Answer 3

higher, lower

Question 4

Phases of the Cardiac Cycle

Answer 4

Phase 1: Atrial Contraction (systole) - Active ventricular filling
Phase 2: Isovolumetric Contraction
Phase 3: Ventricular Ejection
Phase 4: Isovolumetric relaxation
Phase 5: Ventricular Filling (passive)

Question 5

Atrial Contraction (systole) - Active ventricular filling

Answer 5

Semilunar valves closed

Question 6

Isovolumetric Contraction

Answer 6

• Short duration
• No change in blood vol.
• Ventricular contraction starts

Question 7

Ventricular Ejection

Answer 7

• Longer duration
• Strong ventricular contraction
• Blood ejection (aorta, pulm. trunk)

Question 8

Isovolumetric relaxation

Answer 8

• Short duration, no change in blood vol.
• Valves closed
• Decrease in ventricular pressure

Question 9

Ventricular Filling (passive)

Answer 9

• AV valves open, heart relaxed
• 70% ventricular filling

Question 10

Volume changes - ventricular filling

Answer 10

EDV – ESV = SV (amount of blood ejected
from LV per heartbeat)

Question 11

First heart sound

Answer 11

‘lubb’ atrioventricular valves and surrounding fluid vibrations as valves close at beginning of ventricular systole

Question 12

Second heart sound

Answer 12

‘dupp’ results from closure of aortic and pulmonary semilunar valves at beginning of ventricular diastole

Question 13

Third heart sound

Answer 13

(occasional) turbulent blood flow into ventricles and detected near end of first one-third of diastole or during atrial systole