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 Chemical Bonding

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Introduction to Chemical Bonding

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

The Casparian strip in plant roots is correctly described by which of the following?

A protective layer that prevents root damage from soil pathogens

A band of cell wall material that blocks passive flow of materials into the vascular cylinder

A structure that stores nutrients for later use by the plant

A layer of cells that facilitates the transport of water and nutrients

Previous problemNext problem

Verified step by step guidance

Understand the role of the Casparian strip in plant roots. It is a structure found in the endodermis of plant roots.

Recognize that the Casparian strip is composed of suberin, a waxy substance that forms a barrier to passive flow.

Identify the function of the Casparian strip: it regulates the movement of water and solutes into the vascular cylinder by blocking the apoplastic pathway.

Differentiate between the apoplastic and symplastic pathways. The Casparian strip forces water and solutes to enter the symplastic pathway, which involves crossing cell membranes.

Conclude that the Casparian strip is not a protective layer against pathogens, a nutrient storage structure, or a transport facilitator, but rather a selective barrier controlling entry into the vascular system.