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 the following makes up approximately 55% of blood by volume?

Platelets

White blood cells

Red blood cells

Plasma

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Verified step by step guidance

Understand the composition of blood: Blood is composed of plasma and formed elements, which include red blood cells, white blood cells, and platelets.

Identify the role of plasma: Plasma is the liquid component of blood that carries cells and proteins throughout the body. It is primarily made up of water, but also contains electrolytes, nutrients, hormones, and waste products.

Recognize the percentage of plasma in blood: Plasma makes up approximately 55% of the total blood volume, which is the largest component by volume compared to the formed elements.

Differentiate between formed elements: Red blood cells, white blood cells, and platelets collectively make up the remaining 45% of blood volume. Red blood cells are the most abundant formed element, but they do not exceed the volume of plasma.

Conclude that plasma is the correct answer: Given that plasma constitutes about 55% of blood by volume, it is the component that matches the description in the problem.