Body Fluids and Circulation Chapter-Wise Test 16

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which part of the ECG represents ventricular depolarization?

P wave
T wave
QRS complex
PR interval
3

The QRS complex represents ventricular depolarization, which triggers ventricular contraction.

Which of the following statements about blood clotting is correct?

Calcium ions are not involved in clotting.
Thrombin converts fibrin into fibrinogen.
Platelets release clotting factors.
Clotting only occurs inside blood vessels.
3

Platelets release **clotting factors**, initiating the coagulation cascade to form a clot.

Which of the following statements about WBCs is correct?

WBCs lack a nucleus in mature form.
Neutrophils are involved in phagocytosis.
Lymphocytes release histamine during allergic reactions.
Basophils are the most abundant WBCs.
2

**Neutrophils** are the primary **phagocytic cells** that engulf pathogens as part of the immune response.

Which blood disorder is caused by excessive accumulation of cholesterol in arteries?

Anemia
Hypertension
Atherosclerosis
Hemophilia
3

Atherosclerosis occurs due to cholesterol buildup, narrowing the arteries and restricting blood flow.

What is the main function of the coronary arteries?

Transport blood to the brain
Supply oxygen-rich blood to the heart
Carry deoxygenated blood to the lungs
Regulate blood pressure
2

Coronary arteries supply oxygenated blood to the cardiac muscle to ensure proper heart function.

Which of the following statements about ECG is incorrect?

It measures electrical activity of the heart.
The T-wave represents ventricular repolarization.
The QRS complex corresponds to atrial contraction.
It is used to diagnose heart conditions.
3

The **QRS complex represents ventricular depolarization**, not atrial contraction.

Which of the following is NOT a component of the lymphatic system?

Lymph nodes
Spleen
Bone marrow
Trachea
4

The trachea is a part of the respiratory system, not the lymphatic system.

Which of the following is correct about RBCs?

RBCs are nucleated in humans.
RBCs have a lifespan of approximately 120 days.
RBCs primarily function in immune response.
RBCs are the least abundant blood cells.
2

RBCs have a **lifespan of around 120 days** and are responsible for oxygen transport.

What is the function of the hepatic portal system?

Carries oxygenated blood to the liver
Transports absorbed nutrients from the intestine to the liver
Removes carbon dioxide from the liver
Supplies oxygen-rich blood to the kidneys
2

The hepatic portal system transports nutrient-rich blood from the intestine to the liver for metabolism and detoxification.

Which blood group is considered the universal donor?

A
B
AB
O
4

Blood group O has no A or B antigens, making it suitable for transfusion to any blood group.

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