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 Heart2h 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

Which of the following statements about cotransport of solutes across a membrane is correct?

Cotransport involves the hydrolysis of ATP by the transporting protein.

A cotransport protein is most commonly an ion channel.

The sodium-potassium pump is an example of a cotransport protein.

In cotransport, both solutes that are being transported are moving down their chemical gradients.

Cotransport proteins allow a single ATP-powered pump to drive the active transport of many different solutes.

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Verified step by step guidance

Understand the concept of cotransport: Cotransport, also known as secondary active transport, involves the movement of two substances across a membrane. One substance moves down its concentration gradient, which provides the energy for the transport of the other substance against its gradient.

Identify the role of ATP in cotransport: Unlike primary active transport, cotransport does not directly use ATP to move solutes. Instead, it relies on the gradient created by a primary active transport process, such as the sodium-potassium pump, which uses ATP to establish a gradient.

Differentiate between cotransport and ion channels: Cotransport proteins are not ion channels. Ion channels allow ions to move down their concentration gradients without coupling to the movement of another substance.

Clarify the function of the sodium-potassium pump: The sodium-potassium pump is an example of primary active transport, not cotransport. It uses ATP to move sodium and potassium ions against their gradients, creating a gradient that can be used by cotransport proteins.

Recognize the correct statement: Cotransport proteins utilize the gradient established by ATP-powered pumps (like the sodium-potassium pump) to drive the active transport of other solutes, allowing for the movement of multiple solutes across the membrane without directly using ATP.