A&P 2 Chapter 2 Part II
In an adult at rest, the end-diastolic volume is typically
130 mL
During ventricular systole, the
AV valves are closed
What occurs at the area labeled "C" on the graph?
AV valves close
Considering the left ventricle, why does isovolumetric ventricular contraction occur during ventricular systole?
Aortic pressure is higher than ventricular pressure and the ventricle must pressurize the blood to open the aortic valve.
What occurs at the circle labeled "3" on the graph?
Atrial diastole and ventricle systole
What volume is labeled "G" on the graph?
End-systolic volume
What is occurring in the left atrium at the circle labeled "2" on the graph?
Left atrium is in systole
What occurs at the area labeled "B" on the graph?
Semilunar valve closes
What occurs at "A" on the graph?
Semilunar valve opens
Which of the labeled valves will open during ventricular systole to allow the flow of blood to the lungs?
The semilunar valve labeled B
Which of the following is occurring during ventricular diastole?
The ventricles are passively filling and atria are contracting
Drag the labels to connect key events in the cardiac cycle with heart sounds.
Top left: Semilunar valves open Bottom left: AV valves close Top right: semilunar valves close Bottom right: AV valves open Heart sounds: "lubb", "dubb"
Passive refilling of the heart occurs during which phase of the cardiac cycle?
Ventricular diastole
The heart spends most of the cardiac cycle in which phase?
Ventricular diastole
What volume is labeled "E" on the graph?
stroke volume
The contraction phase of the cardiac cycle is called
systole
During the beginning of ventricular systole when the muscle is contracting but not enough pressure has built up to open the semilunar valves the heart is said to be in
isovolumetric contraction
What occurs at the circle labeled "4" on the graph?
isovolumetric ventricular contraction
What occurs at the circle labeled "7" on the graph?
isovolumetric ventricular relaxation
Which of the following events occurs at the red arrow?
opening the AV valves
What occurs at the circle labeled "5" on the graph?
peak systolic pressure
With each ventricular systole,
blood pressure increases
The first heart sound ("lubb") is associated with
closing of the atrioventricular valves
The relaxation phase of the cardiac cycle is called
diastole
What volume is labeled "F" on the graph?
end-diastolic volume
During ventricular systole, the blood pressure __________ and ventricular volume __________
increases; decreases