Body Fluids and Circulation
Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which type of WBCs are responsible for allergic reactions?

Neutrophils
Basophils
Lymphocytes
Monocytes
2

Basophils release histamine and other chemicals that cause allergic reactions.

Which structure in the heart ensures unidirectional blood flow?

Septum
Nodes
Valves
Arteries
3

Heart valves prevent the backflow of blood and ensure unidirectional flow.

Which of the following statements about veins is correct?

Veins always carry deoxygenated blood.
Veins have thinner walls compared to arteries.
Veins do not contain any valves.
Veins transport blood away from the heart.
2

Veins have **thinner walls** than arteries because they carry blood under **low pressure**. However, **pulmonary veins carry oxygenated blood.**

Which of the following statements about the heart is incorrect?

The heart is enclosed in a protective pericardium.
The right atrium receives oxygenated blood from the lungs.
The left ventricle pumps blood into the aorta.
The heart has four chambers.
2

The **right atrium receives deoxygenated blood** from the body via the superior and inferior vena cava, not oxygenated blood.

Which of the following is incorrect about ECG (electrocardiogram)?

ECG records the electrical activity of the heart.
The P-wave represents atrial depolarization.
The T-wave represents ventricular repolarization.
The QRS complex represents atrial contraction.
4

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

Which of the following statements about thrombocytes (platelets) is incorrect?

Platelets help in blood clotting.
Platelets are cell fragments derived from megakaryocytes.
Platelets release clotting factors upon activation.
Platelets transport oxygen to tissues.
4

Platelets are **not involved in oxygen transport**; their primary function is in **blood clotting**.

Which of the following is a function of the lymphatic system?

Oxygen transport
Fat absorption
Glucose metabolism
Blood clotting
2

The lymphatic system helps in the absorption of fats from the intestine through lacteals.

Which enzyme plays a key role in blood clotting?

Pepsin
Thrombin
Trypsin
Amylase
2

Thrombin converts fibrinogen into fibrin, which helps in blood clot formation.

Which ion plays a crucial role in blood clotting?

Sodium (Na⁺)
Potassium (K⁺)
Calcium (Ca²⁺)
Magnesium (Mg²⁺)
3

Calcium ions (Ca²⁺) help activate clotting factors, which are essential for blood coagulation.

Which of the following statements about blood plasma is incorrect?

Plasma contains dissolved proteins such as albumin.
Plasma is responsible for oxygen transport in the blood.
Plasma constitutes about 55% of total blood volume.
Plasma helps in the transport of hormones and nutrients.
2

Oxygen transport is primarily the function of **hemoglobin in RBCs**, not plasma.

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