Cardiovascular System MCQ Quiz - Objective Question with Answer for Cardiovascular System - Download Free PDF

Latest Cardiovascular System MCQ Objective Questions

Cardiovascular System Question 1:

The time taken for atrial systole and diastole in a normal heart are tas and tad seconds, respectively. If ventricular systole takes tvs seconds, calculate the ventricular diastolic time (seconds)

Answer (Detailed Solution Below)

Option 1 : (t as + t ad ) - t vs India's Super Teachers for all govt. exams Under One Roof Demo Classes Available* Enroll For Free Now

Cardiovascular System Question 1 Detailed Solution

The correct answer is (tas+ tad) - tvs

Explanation:

The cardiac cycle consists of a series of events that occur from the beginning of one heartbeat to the beginning of the next. It includes phases of systole (contraction) and diastole (relaxation) of both the atria and ventricles to ensure efficient blood flow through the heart, to the lungs, and to the rest of the body. The duration of these phases needs to be synchronized for the heart to function effectively.

F1 Shraddha Utkarsh 08.12.2021 D2

The total duration of the cardiac cycle can also be viewed as the sum of the durations of atrial systole, atrial diastole, and ventricular systole, plus the ventricular diastole time \(\)

Therefore, the formula for the total cardiac cycle time ttotaL can be written as:
\( t_ = tas + tad + tvs + t_ \)

We can rearrange this equation to solve for the ventricular diastole time tvd:
\(t_ = t_ - (tas + tad + tvs) \)

Assuming that the total duration of the cardiac cycle is equal to one complete cycle of atrial systole plus atrial diastole (since atrial and ventricular phases overlap slightly but can be considered approximately equal for simplicity), then:
\( t_ = tas + tad \)

Using this in our earlier formula for tvd, we get \(t_ = (tas + tad) - tvs \)

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Cardiovascular System Question 2:

For a normal heart, the time taken for atrial systole and diastole are AS and AD seconds respectively, while the same for ventricular systole and diastole are VS and VD. Which one of the following equations is correct?

Answer (Detailed Solution Below)

Option 1 : AS + AD = VS + VD

Cardiovascular System Question 2 Detailed Solution

The correct answer is A S + A D = V S + V D

Explanation:

The cardiac cycle consists of a series of events that occur from the beginning of one heartbeat to the beginning of the next. It includes phases of systole (contraction) and diastole (relaxation) of both the atria and ventricles to ensure efficient blood flow through the heart, to the lungs, and to the rest of the body. The duration of these phases needs to be synchronized for the heart to function effectively.

The total time taken for atrial systole and diastole is equal to the total time taken for ventricular systole and diastole.

F1 Shraddha Utkarsh 08.12.2021 D2

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Cardiovascular System Question 3:

The blood volume of an individual is 5 litres. The person was injected with 500 mg of a drug that has molecular weight of 100 Da. If the drug is metabolized so that half of the drug remains in the bloodstream after every passing hour, the concentration of the drug four hours after injection is:

  1. 0.5 mM
  2. 0.25 mM
  3. 0.125 mM
  4. 0.0625 mM

Answer (Detailed Solution Below)

Option 4 : 0.0625 mM

Cardiovascular System Question 3 Detailed Solution

The correct answer is 0.0625 mM

Explanation:

Find the initial concentration:

Convert the mass of the drug to moles:

Given that the blood volume is 5 liters, the initial concentration (C0) is:

Determine the concentration after each hour:

Initial concentration C0 = 1 mM

Therefore, the concentration of the drug four hours after the injection is: 0.0625 mM

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Cardiovascular System Question 4:

Given below are the different intervals/ durations of electrocardiogram of a human subject (column A) and the events in heart during the process (column B).

COLUMN A COLUMN B
a. PR interval i. Ventricular action potential
b. QRS duration ii. Atrioventricular conduction
c. QT interval iii. Ventricular depolarization
d. ST interval iv. Plateau portion of the ventricular action potential

Which one of the following options is a correct match of entries in columns A and B?
  1. a - i; b - iv; c - ii; d - iii
  2. a - ii: b - iii; c - i; d - iv
  3. a - iv; b - ii; c - iii; d - i
  4. a - iii; b - i; c - iv, d - li

Answer (Detailed Solution Below)

Option 2 : a - ii: b - iii; c - i; d - iv

Cardiovascular System Question 4 Detailed Solution

The correct answer is Option 2 i.e. a - ii: b - iii; c - i; d - iv

Explanation-

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Key Points The electrocardiogram (ECG or EKG) is a graphical representation of the electrical activity of the heart over time. Different intervals and durations are measured on the ECG to assess the cardiac cycle. Here are some of the key intervals and durations observed in a typical human electrocardiogram:

P Wave: Represents atrial depolarization, or the contraction of the atria.


PR Interval : Represents the time it takes for the electrical impulse to travel from the atria to the ventricles.


QRS Complex: Represents ventricular depolarization, or the contraction of the ventricles.


ST Segment: Represents the early part of ventricular repolarization.


T Wave: Represents ventricular repolarization.


QT Interval: Represents the total time for ventricular depolarization and repolarization.


These durations can vary among individuals and may be influenced by factors such as age, sex, and overall health. It's important to note that abnormalities in these intervals can indicate various cardiac conditions and are used in the diagnosis and monitoring of heart diseases.

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Cardiovascular System Question 5:

Which ONE of the following graphs represents the relationship between ventricular end-diastolic volume and cardiac output in a healthy adult individual at rest (solid line) and upon exercise (dotted line)?

  1. qImage65a8c68a2a59e470efde9141
  2. qImage65a8c68a2a59e470efde9145
  3. qImage65a8c68a2a59e470efde9149
  4. qImage65a8c68b2a59e470efde914e

Answer (Detailed Solution Below)

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Option 1 :

Cardiovascular System Question 5 Detailed Solution

The correct answer is Option 1

Concept:

The Frank-Starling mechanism (also known as the Frank-Starling law of the heart) is a fundamental principle in cardiovascular physiology describing the relationship between the volume of blood filling the heart (end-diastolic volume) and the heart's ability to eject blood during systole (stroke volume). In essence, the Frank-Starling mechanism states that the stroke volume of the heart increases in response to an increase in the volume of blood filling the heart (the venous return) up to a physiological limit. This process enables the heart to automatically adjust its pumping capacity to accommodate varying volumes of venous return, ensuring a balanced output between the right and left ventricles and maintaining an equilibrium of blood flow in the circulatory system.

Explanation:

Each graph represents the relationship between ventricular end-diastolic volume and cardiac output in a healthy adult individual at rest (solid line) and upon exercise (dotted line).

Conclusion:

The most physiologically accurate graph for a healthy individual both at rest and upon exercise is likely the first graph. It demonstrates the normal behavior of the heart under both conditions according to the Frank-Starling mechanism.