VASCULAR
TYPES OF ARTERIES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The heart contracts and sends bloods to the arteries.
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The heart relaxes and blood enters from the veins.
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Either A or B
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None of the above
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Detailed explanation-1: -In the systole phase, blood is forced to flow from the two atria into their respective ventricles as the atrial muscles contract due to the depolarization of the atria.
Detailed explanation-2: -The cardiac cycle is essentially split into two phases, systole (the contraction phase) and diastole (the relaxation phase). Each of these is then further divided into an atrial and ventricular component.
Detailed explanation-3: -One complete heartbeat is made up of two phases: The first phase is called systole (SISS-tuh-lee). This is when the ventricles contract and pump blood into the aorta and pulmonary artery. During systole, the atrioventricular valves close, creating the first sound (the lub) of a heartbeat.
Detailed explanation-4: -During systole, the aortic and pulmonic valves open to permit ejection into the aorta and pulmonary artery. The atrioventricular valves are closed during systole; therefore, no blood is entering the ventricles; however, blood continues to enter the atria though the vena cavae and pulmonary veins.