Module 5: Section 4

Question 1

Systole

Answer 1

Periods of contraction

Question 2

Diastole

Answer 2

Periods of relaxation

Question 3

Heart Sounds and Valve Function

Answer 3

• Heart sounds are a non-invasive way to assess heart function using a stethoscope
• Occur due to vibrations created when valves close, producing turbulent flow
• When valves open, blood moves smoothly in laminar flow, making little to no sound

Question 4

Heart sound 1

Answer 4

• Occurs when the AV valves close
• Sound is described as “lub”
• Signals beginning of ventricular systole

Question 5

Heart sound 2

Answer 5

• Occurs when the semilunar valve closes
• Makes a “dub” sound
• Signals the onset of ventricular diastole

Question 6

Valve defect 1

Answer 6

• Valve does not fully open
• Called a stenotic valve
• The opening through the blood must flow is restricted, which increases velocity and amount of turbulent blood flow
• Causes a whistle-like sound

Question 7

Valve defect 2

Answer 7

• Valve does not fully close
• Called an insufficient or leaky valve
• It allows the back flow of blood (regurgitation), which is turbulent
• Creates a swishing or gurgling sound