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

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

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Multiple Choice

Which of the following helps return blood to the heart?

Lymphatic drainage

Arterial pressure

Pulmonary ventilation

Skeletal muscle contractions

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Verified step by step guidance

Understand the problem: The question asks which mechanism helps return blood to the heart. This involves understanding the circulatory system and the role of various physiological processes in venous blood flow.

Recall the anatomy and physiology of veins: Veins have one-way valves that prevent backflow and rely on external forces to help move blood toward the heart, as they do not have the same pressure as arteries.

Identify the role of skeletal muscle contractions: Skeletal muscles contract and compress nearby veins, pushing blood through the one-way valves toward the heart. This is known as the 'muscle pump' mechanism.

Eliminate incorrect options: Lymphatic drainage is involved in returning interstitial fluid to the circulatory system, not directly in venous blood flow. Arterial pressure drives blood away from the heart, not toward it. Pulmonary ventilation primarily aids in gas exchange, not venous return.

Conclude that skeletal muscle contractions are the correct answer because they play a direct role in assisting venous blood return to the heart by utilizing the muscle pump mechanism.