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

Introduction to Membrane Transport

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Introduction to Membrane Transport

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Multiple Choice

Ions are transported across plasma membranes using , which requires .

facilitated diffusion; carrier proteins without energy

active transport; energy in the form of ATP

simple diffusion; no energy

osmosis; water channels

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Verified step by step guidance

Step 1: Understand the concept of ion transport across plasma membranes. Ions are charged particles that cannot pass freely through the hydrophobic lipid bilayer of the plasma membrane. They require specific mechanisms to move across the membrane.

Step 2: Review the different types of transport mechanisms: (1) Simple diffusion, which does not require energy and occurs down the concentration gradient; (2) Facilitated diffusion, which uses carrier or channel proteins but does not require energy; (3) Osmosis, which is the movement of water through aquaporins; and (4) Active transport, which requires energy in the form of ATP to move substances against their concentration gradient.

Step 3: Focus on active transport. Active transport is the process by which ions or molecules are moved across the plasma membrane against their concentration gradient, requiring energy input. This energy is typically provided by ATP.

Step 4: Identify the correct answer based on the question. The question specifies that ions are transported across plasma membranes using a mechanism that requires energy. This matches the description of active transport, which uses ATP as the energy source.

Step 5: Eliminate incorrect options. Facilitated diffusion does not require energy, simple diffusion does not involve carrier proteins, and osmosis pertains to water movement rather than ion transport. Therefore, the correct answer is 'active transport; energy in the form of ATP.'