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

2. Cell Chemistry & Cell Components

Active Transport

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Active Transport

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Multiple Choice

Why does active transport of molecules across a membrane require ATP?

Because it involves passive diffusion of molecules.

Because it moves molecules against their concentration gradient.

Because it moves molecules along their concentration gradient.

Because it relies on the natural kinetic energy of molecules.

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Verified step by step guidance

Understand the concept of concentration gradients: Molecules naturally move from areas of high concentration to areas of low concentration, a process known as passive diffusion.

Recognize that active transport is different from passive diffusion: Active transport moves molecules from areas of low concentration to areas of high concentration, which is against the natural concentration gradient.

Identify the energy requirement: Moving molecules against their concentration gradient requires energy because it is not a spontaneous process.

Learn the role of ATP in active transport: ATP (adenosine triphosphate) provides the necessary energy for active transport by undergoing hydrolysis, which releases energy.

Connect the concepts: Since active transport requires energy to move molecules against their concentration gradient, ATP is essential to provide this energy, distinguishing it from passive processes that do not require energy input.