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 substances has higher levels in capillary blood than in venous blood?

Urea

Lactic acid

Oxygen

Carbon dioxide

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Verified step by step guidance

Understand the difference between capillary blood and venous blood. Capillary blood is the blood that is found in the small blood vessels that connect arteries and veins, while venous blood is the blood that is returning to the heart through the veins.

Consider the role of oxygen in the circulatory system. Oxygen is carried by red blood cells from the lungs to the tissues of the body. In the capillaries, oxygen is delivered to the tissues, and carbon dioxide is picked up as a waste product.

Recognize that in capillary blood, oxygen levels are typically higher because this is where oxygen is being delivered to the tissues. In contrast, venous blood has lower oxygen levels because it has already delivered oxygen to the tissues and is carrying carbon dioxide back to the lungs.

Compare the levels of other substances listed in the problem. Urea and lactic acid are metabolic waste products that are generally higher in venous blood as they are transported to the kidneys and liver for processing and excretion.

Conclude that oxygen is the substance with higher levels in capillary blood compared to venous blood, as it is actively being delivered to the tissues in the capillaries.