Body Fluids and Circulation Chapter-Wise Test 6

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which heart valve prevents the backflow of blood from the aorta into the left ventricle?

Tricuspid valve
Pulmonary valve
Aortic valve
Mitral valve
3

The aortic valve prevents blood from flowing back into the left ventricle from the aorta.

Which of the following statements about blood pressure is incorrect?

Systolic pressure is higher than diastolic pressure.
Diastolic pressure occurs when the ventricles contract.
A normal blood pressure reading is around 120/80 mmHg.
Blood pressure is measured using a sphygmomanometer.
2

Diastolic pressure occurs when the heart relaxes, while systolic pressure occurs during ventricular contraction.

Which of the following statements about ECG is correct?

The P-wave represents ventricular contraction.
The QRS complex represents ventricular depolarization.
The T-wave represents atrial depolarization.
ECG does not measure electrical activity of the heart.
2

The QRS complex represents ventricular depolarization, leading to ventricular contraction.

Which of the following is correct about the role of the AV node?

It generates the heartbeat independently.
It slows down the electrical impulse before it reaches the ventricles.
It is located in the left ventricle.
It transmits signals directly to the Purkinje fibers.
2

The AV node slows down the electrical signal from the SA node before sending it to the ventricles, allowing the atria to contract first.

Which of the following statements about the structure of the heart is incorrect?

The heart is composed of cardiac muscle tissue.
The left ventricle pumps blood to the lungs.
The right atrium receives deoxygenated blood from the body.
The heart is enclosed within a pericardial membrane.
2

The left ventricle pumps blood to the aorta, not the lungs. The right ventricle pumps blood to the lungs.

Which part of the heart has the thickest wall?

Right atrium
Left atrium
Right ventricle
Left ventricle
4

The left ventricle has the thickest wall to generate high pressure for pumping blood to the entire body.

Which blood cells are the largest in size?

Erythrocytes
Neutrophils
Lymphocytes
Monocytes
4

Monocytes are the largest WBCs and play a role in phagocytosis.

Which of the following statements about the cardiac cycle is correct?

Systole refers to heart relaxation.
Diastole refers to heart contraction.
One complete cardiac cycle lasts approximately 0.8 seconds.
The atria and ventricles contract simultaneously.
3

The duration of one complete cardiac cycle is about 0.8 seconds in a healthy adult.

Which blood vessels carry oxygenated blood to the heart?

Pulmonary veins
Pulmonary artery
Vena cava
Aorta
1

Pulmonary veins carry oxygenated blood from the lungs to the left atrium of the heart.

Which of the following is correct about cardiac output?

Cardiac output is the amount of blood pumped per second.
Cardiac output = stroke volume × heart rate.
Cardiac output remains constant under all conditions.
Cardiac output is not influenced by exercise.
2

Cardiac output is calculated as stroke volume × heart rate and varies depending on physical activity.

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