Body Fluids and Circulation
Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which hormone is released in response to low blood pressure and helps retain water?

Adrenaline
Insulin
Antidiuretic hormone (ADH)
Glucagon
3

Antidiuretic hormone (ADH) increases water reabsorption in the kidneys, helping to raise blood pressure.

Which of the following is correct about hemoglobin?

Hemoglobin is present in WBCs.
Hemoglobin binds with oxygen for transport.
Hemoglobin does not contain iron.
Hemoglobin plays no role in carbon dioxide transport.
2

**Hemoglobin binds oxygen in RBCs and also helps transport carbon dioxide.**

Which component of blood is responsible for oxygen transport?

Plasma
Leukocytes
Erythrocytes
Platelets
3

Erythrocytes (RBCs) contain hemoglobin, which binds with oxygen and facilitates its transport.

What is the lifespan of red blood cells (RBCs) in humans?

30 days
60 days
90 days
120 days
4

The average lifespan of RBCs is 120 days before they are broken down in the spleen.

Which of the following statements about veins is correct?

Veins have thicker walls than arteries.
Veins carry blood under low pressure.
Veins do not contain any valves.
Veins always carry oxygenated blood.
2

Veins have **thin walls** and carry blood under **low pressure** back to the heart.

Which of the following statements about blood clotting is correct?

Platelets do not play any role in clot formation.
Prothrombin is converted into thrombin by calcium ions and clotting factors.
Fibrinogen is an inactive form of thrombin.
Blood clotting is an enzymatic process but does not require calcium ions.
2

**Prothrombin is converted into thrombin** by the action of calcium ions and clotting factors like **thromboplastin**.

Which of the following is incorrect about the function of veins?

Veins carry blood toward the heart.
Veins have thinner walls than arteries.
Veins always carry deoxygenated blood.
Veins contain valves to prevent backflow.
3

Not all veins carry deoxygenated blood. **Pulmonary veins carry oxygenated blood** from the lungs to the left atrium.

Which of the following is the most abundant plasma protein?

Fibrinogen
Albumin
Globulin
Prothrombin
2

Albumin is the most abundant plasma protein and helps maintain osmotic pressure.

Which part of the circulatory system directly supplies oxygenated blood to the heart muscle?

Pulmonary circulation
Systemic circulation
Coronary circulation
Hepatic portal circulation
3

Coronary circulation supplies oxygenated blood to the heart muscle through coronary arteries.

Which of the following statements is correct regarding blood?

Blood is a specialized epithelial tissue.
Blood consists of plasma and formed elements.
Blood transports only oxygen and no other substances.
Blood does not contain proteins.
2

Blood consists of a liquid matrix (plasma) and formed elements (RBCs, WBCs, platelets).

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