Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 39m
3. Energy & Cell Processes10h 8m
4. Tissues & Histology10h 3m
5. Integumentary System2h 28m
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 System3h 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

Endocytosis and Exocytosis

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Endocytosis and Exocytosis

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Multiple Choice

The difference between pinocytosis and receptor-mediated endocytosis is that ________.

Pinocytosis brings only water molecules into the cell, receptor-mediated endocytosis brings in other molecules also

Pinocytosis increases the surface area of the plasma membrane, receptor-mediated endocytosis decreases it

Pinocytosis is nonselective, receptor-mediated endocytosis offers more selectivity

Pinocytosis can concentrate substances from the extracellular fluid, receptor-mediated endocytosis cannot

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Verified step by step guidance

Understand the basic definitions: Pinocytosis is a type of endocytosis where the cell ingests extracellular fluid and its dissolved solutes. Receptor-mediated endocytosis is a more specific form of endocytosis where cells absorb metabolites, hormones, proteins – and in some cases viruses – by the inward budding of the plasma membrane vesicles containing proteins with receptor sites specific to the molecules being absorbed.

Identify the key difference: Pinocytosis is nonselective, meaning it does not target specific molecules; it engulfs whatever solutes are in the extracellular fluid. In contrast, receptor-mediated endocytosis is selective because it involves receptors that bind to specific ligands (molecules).

Consider the selectivity aspect: In receptor-mediated endocytosis, the presence of specific receptors on the cell surface allows the cell to target and concentrate specific substances from the extracellular environment, which is not the case in pinocytosis.

Evaluate the options given: The correct answer should reflect the selectivity difference between the two processes. Pinocytosis being nonselective and receptor-mediated endocytosis offering more selectivity aligns with the definitions.

Conclude with the correct choice: Based on the understanding of the processes, the statement 'Pinocytosis is nonselective, receptor-mediated endocytosis offers more selectivity' accurately describes the fundamental difference between the two types of endocytosis.