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

Intracellular Receptors and Direct Gene Action

Anatomy & Physiology

16. The Endocrine System

Intracellular Receptors and Direct Gene Action

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Multiple Choice

Which pair of terms below correctly matches the molecule with the pathway?

Intracellular reception: receptor-hormone complex.

Second messenger system: G protein.

Intracellular reception: adenylate cyclase.

A & B are both correct.

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Verified step by step guidance

Understand the concept of intracellular reception: This involves a receptor located inside the cell, typically in the cytoplasm or nucleus, where it binds to a hormone to form a receptor-hormone complex. This complex can then influence gene expression directly.

Explore the second messenger system: This is a mechanism where the binding of a hormone to a receptor on the cell surface activates a G protein. The G protein then triggers a cascade of intracellular events, often involving the production of second messengers like cyclic AMP (cAMP).

Identify the role of adenylate cyclase: In the second messenger system, adenylate cyclase is an enzyme activated by the G protein. It converts ATP to cyclic AMP, which acts as a second messenger to propagate the signal within the cell.

Match the terms with their pathways: Intracellular reception is correctly associated with the receptor-hormone complex, as it involves direct interaction within the cell. The second messenger system is correctly associated with the G protein, as it initiates the signaling cascade.

Conclude the correct matches: Based on the explanations, the correct pairings are 'Intracellular reception: receptor-hormone complex' and 'Second messenger system: G protein'. Therefore, both A and B are correct.