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 mechanisms helps return blood to the heart during the cardiac cycle?

Ventricular ejection

Venous valves

Atrial contraction

Coronary circulation

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Verified step by step guidance

Understand the role of venous valves: Venous valves are structures within veins that prevent the backflow of blood, ensuring it moves in one direction towards the heart.

Consider the function of ventricular ejection: This is the phase of the cardiac cycle where the ventricles contract to push blood into the arteries, not directly related to returning blood to the heart.

Evaluate atrial contraction: Atrial contraction helps fill the ventricles with blood but does not directly assist in returning blood from the body to the heart.

Analyze coronary circulation: This refers to the circulation of blood in the blood vessels of the heart muscle itself, not the return of blood to the heart.

Conclude that venous valves are the primary mechanism that assists in returning blood to the heart by preventing backflow and aiding venous return during the cardiac cycle.