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

In the context of cell communication, how do paracrine signaling and endocrine signaling differ?

Paracrine signaling involves hormones traveling through the bloodstream, while endocrine signaling involves local mediators affecting nearby cells.

Paracrine signaling affects nearby cells through local mediators, while endocrine signaling involves hormones traveling through the bloodstream to distant targets.

Both paracrine and endocrine signaling involve direct cell-to-cell contact for communication.

Paracrine signaling is a form of electrical communication, whereas endocrine signaling is a form of chemical communication.

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Verified step by step guidance

Understand the basic definitions: Paracrine signaling involves the release of signaling molecules that affect nearby cells, while endocrine signaling involves hormones that travel through the bloodstream to reach distant target cells.

Identify the key difference in the range of action: Paracrine signaling acts locally, affecting cells in the immediate vicinity, whereas endocrine signaling has a systemic effect, reaching cells throughout the body.

Consider the mode of transport: In paracrine signaling, local mediators diffuse through the extracellular space to nearby cells. In contrast, endocrine signaling involves hormones being secreted into the bloodstream, allowing them to travel to distant sites.

Clarify the type of communication: Both paracrine and endocrine signaling are forms of chemical communication, not electrical. They rely on chemical messengers to convey signals between cells.

Recognize the misconception: Direct cell-to-cell contact is not a characteristic of either paracrine or endocrine signaling. These processes involve the release and reception of signaling molecules, not direct physical contact between cells.