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 does not require the release of a first messenger in signal transduction?

Steroid hormone receptors

Ion channel-linked receptors

Tyrosine kinase receptors

G-protein coupled receptors

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Verified step by step guidance

Understand the concept of signal transduction, which is the process by which a chemical or physical signal is transmitted through a cell as a series of molecular events, most commonly protein phosphorylation catalyzed by protein kinases, ultimately resulting in a cellular response.

Identify the role of first messengers in signal transduction. First messengers are extracellular signaling molecules, such as hormones or neurotransmitters, that bind to receptors on the cell surface to initiate the signaling cascade.

Examine the different types of receptors listed in the problem: Steroid hormone receptors, Ion channel-linked receptors, Tyrosine kinase receptors, and G-protein coupled receptors.

Recognize that steroid hormone receptors are intracellular receptors. Steroid hormones can pass through the cell membrane without the need for a first messenger because they are lipophilic, meaning they can directly interact with intracellular receptors.

Contrast this with the other receptor types: Ion channel-linked receptors, Tyrosine kinase receptors, and G-protein coupled receptors, which typically require a first messenger to bind to the receptor on the cell surface to initiate signal transduction.