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

What is Anatomy & Physiology?

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

What is Anatomy & Physiology?

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Multiple Choice

Which property of a hormone allows it to pass unassisted through a plasma membrane?

Having a large molecular size

Being charged (ionic)

Being lipid-soluble

Being water-soluble

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Verified step by step guidance

Understand the structure of the plasma membrane: The plasma membrane is primarily composed of a phospholipid bilayer, which has hydrophobic (water-repelling) tails and hydrophilic (water-attracting) heads. This structure allows lipid-soluble substances to pass through easily, while water-soluble or charged molecules require assistance.

Analyze the properties of hormones: Hormones can be classified based on their solubility. Lipid-soluble hormones, such as steroid hormones, can diffuse directly through the hydrophobic core of the plasma membrane without assistance.

Contrast lipid-soluble and water-soluble hormones: Water-soluble hormones, such as peptide hormones, cannot pass through the hydrophobic core of the plasma membrane due to their polarity and size. They require membrane-bound receptors or transport mechanisms to enter the cell.

Evaluate the role of molecular size and charge: Large molecular size and ionic charge hinder the ability of a substance to pass through the plasma membrane unassisted. These properties are characteristic of water-soluble hormones, not lipid-soluble ones.

Conclude that lipid solubility is the key property: Lipid-soluble hormones can pass unassisted through the plasma membrane because they are compatible with the hydrophobic environment of the phospholipid bilayer.