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Difficulty: EasyHuman Physiology, Health, and Diseases

Which of the following statements regarding human blood components and their functions are correct?

  1. Red blood cells (erythrocytes) contain hemoglobin, which is responsible for transporting oxygen to body tissues.Answer
  2. B
    Blood platelets (thrombocytes) are primarily responsible for synthesizing neutralizing antibodies against pathogens.
  3. White blood cells (leukocytes) serve as a crucial component of the human immune system to combat infections.Answer
  4. D
    Blood plasma consists predominantly of cellular elements by total volume.

Answer

The correct statements are those identifying red blood cells as oxygen carriers via hemoglobin and white blood cells as key defensive components of the immune system.
Red blood cells carry oxygen using hemoglobin throughout the circulatory system, and white blood cells provide cellular and humoral defense mechanisms against disease. Both of these statements correctly describe human blood physiology.

Step-by-Step Solution

1
Evaluate the statement concerning red blood cells (erythrocytes).
Erythrocytes are rich in hemoglobin and their principal function is oxygen transport from respiratory organs to tissues.
This statement accurately describes erythrocyte physiology.
2
Evaluate the statement concerning blood platelets (thrombocytes).
Platelets function in blood coagulation, while lymphocyte white blood cells secrete antibodies.
Confusing platelet function with lymphocyte immune defense is incorrect.
3
Evaluate the statement concerning white blood cells (leukocytes).
Leukocytes constitute the core cellular defenses of the immune system.
This statement correctly defines leukocyte physiological role.
4
Evaluate the statement concerning blood plasma composition.
Plasma is about 90–92% water with dissolved proteins, whereas cellular components form the rest of whole blood.
Describing plasma as mostly cellular elements misrepresents blood fluid composition.

Key Concept

Composition of Human Blood and Physiological Roles of Formed Elements
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Topics

Human Physiology, Health, and Diseases

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