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

16. The Endocrine System

Membrane Bound Receptors and Secondary Messengers

Anatomy & Physiology

16. The Endocrine System

Membrane Bound Receptors and Secondary Messengers

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Multiple Choice

Which of the following correctly describes a second messenger?

A lipid that anchors proteins to the cell membrane

A molecule that relays signals from a receptor to target molecules inside the cell

A protein that forms a channel in the cell membrane

A molecule that directly binds to a receptor on the cell surface

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Verified step by step guidance

Understand the concept of a second messenger: A second messenger is a molecule that transmits signals from a receptor on the cell surface to target molecules inside the cell, initiating a physiological response.

Identify the role of second messengers in cell signaling: They are part of a signaling cascade that amplifies the signal received by the receptor, allowing for a larger cellular response.

Differentiate second messengers from other molecules: Unlike lipids that anchor proteins or proteins that form channels, second messengers do not directly interact with the cell membrane but work inside the cell.

Recognize common examples of second messengers: These include cyclic AMP (cAMP), inositol triphosphate (IP3), and calcium ions (Ca2+), which are involved in various signaling pathways.

Evaluate the options given: The correct description of a second messenger is 'A molecule that relays signals from a receptor to target molecules inside the cell,' as it accurately reflects the role of second messengers in cellular communication.