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

Which of the following accurately describes the direction phloem sap can flow in plants?

From roots to flowers only

From roots to leaves only

Both upward and downward

From leaves to roots only

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Verified step by step guidance

Understand the function of phloem in plants: Phloem is responsible for transporting nutrients, primarily sugars produced through photosynthesis, throughout the plant.

Recognize the bidirectional nature of phloem transport: Unlike xylem, which primarily transports water and minerals upward from roots to leaves, phloem can transport nutrients both upward and downward.

Consider the source and sink concept: In plants, the source is where sugars are produced (usually the leaves), and the sink is where sugars are needed or stored (such as roots, fruits, or flowers). Phloem sap can flow from sources to sinks, regardless of their position in the plant.

Evaluate the options given: The options suggest unidirectional flow, but phloem sap can move in both directions to meet the plant's needs.

Conclude that the correct description of phloem sap flow is both upward and downward, allowing for flexibility in nutrient distribution based on the plant's requirements.