ECG: What Do You Know About Cardiac Cycle? Trivia Quiz
ECG: what do you know about the cardiac cycle? The heart is one of the most important organs in the human body, and it makes at least seventy beats per minute, which ensures blood is pumped to all vital organs. By taking this quiz, you will be testing your knowledge of what happens from one beat until the next one is achieved. Give it a try!
- 1.
The heart sound ‘dup’ because
- A.
The flow of blood into the heart
- B.
The flow of blood from the atrium into the ventricles
- C.
The closure of the atrioventricular valves
- D.
Recoil of the blood against closure of the semilunar valves
Correct Answer
D. Recoil of the blood against closure of the semilunar valvesExplanation
The correct answer is "recoil of the blood against closure of the semilunar valves." When the semilunar valves close, the blood flowing back towards the heart experiences resistance and creates a recoil effect. This recoil causes a sound known as "dup." The other options listed do not directly relate to the sound produced by the closure of the semilunar valves.Rate this question:
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- 2.
Which of the following events in a normal cardiac cycle takes the shortest time?
- A.
Atrial systole, ventricle diastole
- B.
Atrial and ventricle diastole
- C.
Atrial and ventricle systole
- D.
Atrial diastole, ventricle systole
Correct Answer
A. Atrial systole, ventricle diastoleExplanation
During a normal cardiac cycle, the atria contract during atrial systole, while the ventricles relax during ventricular diastole. Atrial systole is the contraction of the atria, which pushes blood into the ventricles. Ventricle diastole is the relaxation of the ventricles, allowing them to fill with blood. Atrial systole takes a shorter time compared to ventricle diastole because the atria have a smaller volume to contract and push blood into the ventricles, while the ventricles have a larger volume to relax and fill with blood. Therefore, atrial systole takes the shortest time.Rate this question:
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- 3.
During ventricular systole
- A.
Blood flows from the ventricles to the pulmonary arteries
- B.
The ventricles relax
- C.
The atrium contract
- D.
The tricuspid and mitral valves are opened
Correct Answer
A. Blood flows from the ventricles to the pulmonary arteriesExplanation
During ventricular systole, the ventricles contract, causing the tricuspid and mitral valves to close. This prevents blood from flowing back into the atria. At the same time, the pulmonary and aortic valves open, allowing blood to be pumped out of the ventricles. In this case, blood flows from the ventricles to the pulmonary arteries, which carry deoxygenated blood to the lungs for oxygenation.Rate this question:
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- 4.
Which of the following supplies the right side of the heart with blood?
- A.
The pulmonary veins
- B.
The pulmonary arteries
- C.
The superior and inferior vena cava
- D.
The aorta
Correct Answer
C. The superior and inferior vena cavaExplanation
The superior and inferior vena cava supply the right side of the heart with blood. The vena cavae are large veins that carry deoxygenated blood from the body back to the heart. The superior vena cava collects blood from the upper body, including the head, neck, and upper extremities, while the inferior vena cava collects blood from the lower body, including the abdomen, pelvis, and lower extremities. This deoxygenated blood is then pumped into the right atrium of the heart, where it is then sent to the right ventricle and eventually to the lungs for oxygenation.Rate this question:
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- 5.
What happen during QRS complex in electrocardiogram
- A.
Ventricular systole
- B.
Ventricular diastole
- C.
Atria systole
- D.
Atria diastole
Correct Answer
A. Ventricular systoleExplanation
During the QRS complex in an electrocardiogram, the ventricles of the heart contract, which is known as ventricular systole. This contraction allows the ventricles to pump blood out of the heart and into the arteries. The QRS complex represents the depolarization of the ventricles, which leads to their contraction. This is an important phase of the cardiac cycle as it ensures that oxygenated blood is efficiently pumped to the rest of the body.Rate this question:
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- 6.
QRS-complex occurs during which phase?
- A.
Atrial depolarization
- B.
Ventricular depolarization
- C.
Atrial repolarization
- D.
Ventrial repolarization
Correct Answer
B. Ventricular depolarizationExplanation
The QRS-complex occurs during ventricular depolarization. This is the phase in which the electrical activity spreads through the ventricles, causing them to contract and pump blood out of the heart. The QRS-complex is a visual representation of this depolarization on an electrocardiogram (ECG). It consists of three waves: Q, R, and S, which correspond to different parts of the ventricular depolarization process. Therefore, the correct answer is "Ventricular depolarization."Rate this question:
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- 7.
When the pressure in the ventricles becomes lower than the pressure in the atria…
- A.
The ventricles contract.
- B.
Blood flows into the pulmonary trunk.
- C.
Blood flows into the aorta.
- D.
The atrioventricular valves open.
Correct Answer
D. The atrioventricular valves open.Explanation
When the pressure in the ventricles becomes lower than the pressure in the atria, it indicates that the ventricles are in the diastole phase of the cardiac cycle. During this phase, the atrioventricular valves open, allowing blood to flow from the atria into the ventricles. This is necessary for the ventricles to fill with blood before they contract during the systole phase. Therefore, the correct answer is that the atrioventricular valves open.Rate this question:
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- 8.
The highest rate of increased pressure happens in
- A.
Right ventricle
- B.
Right atrium
- C.
Left ventricle
- D.
Left atrium
Correct Answer
C. Left ventricleExplanation
The left ventricle is responsible for pumping oxygenated blood to the rest of the body, so it experiences the highest rate of increased pressure during systole when it contracts to push blood out into the aorta. This is because the left ventricle has thicker and more muscular walls compared to the right ventricle, allowing it to generate greater force and pressure. The right ventricle, on the other hand, pumps blood to the lungs, which have lower resistance and pressure, resulting in a lower rate of pressure increase. The atria, both right and left, primarily receive blood and do not generate as much pressure as the ventricles.Rate this question:
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- 9.
The beginning of ventricular systole is when blood flowing back toward the relaxed ventricles causes the semilunar valves to close.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The beginning of ventricular systole is actually when the ventricles contract, causing the semilunar valves to open and blood to be pumped out of the heart. The closing of the semilunar valves occurs at the end of ventricular systole, when the ventricles relax and blood begins to flow back toward them. Therefore, the statement is false.Rate this question:
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- 10.
The atria never need to contract due to passive ventricular filling.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because the atria do need to contract in order to facilitate ventricular filling. During the cardiac cycle, the atria contract to push blood into the ventricles, which is known as atrial systole. This contraction helps to complete the filling of the ventricles before they contract (ventricular systole) to pump blood out of the heart. Therefore, the atria play an active role in the filling of the ventricles and their contraction is necessary for proper cardiac function.Rate this question:
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Current Version
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Mar 22, 2023Quiz Edited by
ProProfs Editorial Team -
Feb 06, 2020Quiz Created by
Noriantie Binti
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