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 accurately describes a closed circulatory system?

The heart pumps blood into large sinuses where it mixes with interstitial fluid.

Blood flows freely through body cavities, directly bathing organs.

Oxygen is directly absorbed from the environment into the bloodstream without the use of lungs or gills.

Blood is contained within vessels and circulates unidirectionally from the heart around the body.

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Verified step by step guidance

Understand the concept of a closed circulatory system: In a closed circulatory system, blood is contained within a network of blood vessels, which allows for efficient transport of nutrients, gases, and waste products throughout the body.

Identify the key components of a closed circulatory system: These include the heart, which acts as a pump, and a series of blood vessels (arteries, veins, and capillaries) that form a closed loop.

Differentiate between open and closed circulatory systems: In an open circulatory system, blood is not confined to vessels and instead flows freely through body cavities, directly bathing organs. In contrast, a closed system keeps blood within vessels.

Analyze the given options: Evaluate each statement to determine if it aligns with the characteristics of a closed circulatory system. Look for descriptions that mention blood being contained within vessels and circulating in a controlled manner.

Select the correct description: The statement 'Blood is contained within vessels and circulates unidirectionally from the heart around the body' accurately describes a closed circulatory system, as it highlights the containment and directional flow of blood.