Afterload is the pressure threshold that must be exceeded to open _______.Question 2Select one:A.the aortic semilunar valveB.the tricuspid valveC.the aortic semilunar valve and the pulmonary semilunar valveD.the pulmonary semilunar valve and the tricuspid valveE.the pulmonary semilunar valve
Question
Afterload is the pressure threshold that must be exceeded to open _______.Question 2Select one:A.the aortic semilunar valveB.the tricuspid valveC.the aortic semilunar valve and the pulmonary semilunar valveD.the pulmonary semilunar valve and the tricuspid valveE.the pulmonary semilunar valve
Solution
The correct answer is C. the aortic semilunar valve and the pulmonary semilunar valve.
Afterload is the pressure that the heart must work against to eject blood during systole (heart contraction). It is the pressure threshold that must be exceeded to open the aortic semilunar valve and the pulmonary semilunar valve. These valves are responsible for controlling the flow of blood out of the heart. The aortic semilunar valve controls the flow of blood out of the left ventricle into the aorta (the main artery that carries blood from the heart to the rest of the body), and the pulmonary semilunar valve controls the flow of blood out of the right ventricle into the pulmonary artery (which carries blood from the heart to the lungs).
Similar Questions
Preload is closely related to the following:Question 8Select one:a.None of the aboveb.End Systolic Volumec.Afterloadd.End Diastolic Volume
During the ejection period, _______.Question 3Select one:A.blood is pumped into the aorta and the pulmonary trunkB.blood is pumped into the aortaC.the ventricles are fillingD.blood is pumped into the pulmonary trunkE.the atria are filling
For blood to be ejected from the ventricles, ventricular pressures must be _____ pressures in the pulmonary trunk and aorta.Multiple choice question.greater thanthe same asless than
The opening and closing of the heart valves is associated with ______.Multiple choice question.changes in blood oxygenationchanges in blood compositionchanges in chamber pressurestretch of tissue fibers in the pericardium
What changes in pressure lead to the opening and closing of heart valves?
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