Heart as a pump

Guyton

2011

chapter 9

Heart as a pump

Heart as a pump

Excitation-contraction Coupling

Ca induced Ca Released

Heart as a pump

Excitation-contraction Coupling

Heart as a pumpCardiac cycle

Heart as a pumpCardiac cycle

Heart as a pumpCardiac cycle

Heart as a pumpCardiac cycle

Heart as a pumpCardiac cycle

Heart as a pumpCardiac cycle

Heart as a pumpCardiac cycle

Heart as a pumpCardiac cycle

Heart as a pumpCardiac cycle

Heart as a pumpCardiac cycle

Heart as a pumpEffect of Heart Rate on Duration of Cardiac Cycle

Diastole Systole Heart rate

0.6 0.4 72 beats/min

0.35 0.65 216 beats/min

40% 60%

65% 35%

Heart as a pump

Cardiac valves

Semilunar Valves

Av ValvesMitral

Tricuspid Aorta

Pulmonary

Heart as a pump

Cardiac Sounds

• Low frequency

• Loudest and longest

• High frequency

• Shorter duration

• Low intensity

• In children with thin chest wall

and heart failure

• In early diastole

•Atrial contraction

•Occasionally in healthy

individual

S1

S4

S2

S3

The End