Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

17. The Blood

Introduction To Blood

Anatomy & Physiology

17. The Blood

Introduction To Blood

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Multiple Choice

Which of these components makes up the greatest portion of whole blood by volume?

Platelets

Plasma

White blood cells

Red blood cells

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Verified step by step guidance

Begin by understanding the composition of whole blood. Whole blood consists of plasma, red blood cells, white blood cells, and platelets.

Plasma is the liquid portion of blood and serves as a transport medium for nutrients, hormones, and waste products. It makes up about 55% of the total blood volume.

Red blood cells, also known as erythrocytes, are responsible for carrying oxygen from the lungs to the rest of the body and returning carbon dioxide to the lungs for exhalation. They make up about 45% of the blood volume.

White blood cells, or leukocytes, are part of the immune system and help fight infections. They make up less than 1% of the blood volume.

Platelets, or thrombocytes, are involved in blood clotting and also make up less than 1% of the blood volume. Therefore, plasma constitutes the greatest portion of whole blood by volume.