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 structures act as gates that regulate the flow of blood in one direction?

Capillaries

Veins

Arteries

Valves

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Verified step by step guidance

Understand the function of valves in the circulatory system: Valves are structures that ensure blood flows in one direction, preventing backflow.

Identify where valves are located: Valves are primarily found in veins and the heart. They are not present in arteries or capillaries.

Differentiate between veins, arteries, and capillaries: Veins carry blood back to the heart and have valves to prevent backflow. Arteries carry blood away from the heart and do not have valves. Capillaries are small blood vessels where gas exchange occurs and also do not have valves.

Recognize the role of valves in veins: In veins, valves are crucial for maintaining unidirectional blood flow, especially in the extremities, where blood must travel against gravity.

Conclude that valves are the structures that regulate the flow of blood in one direction, ensuring efficient circulation and preventing issues such as venous insufficiency.