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

What happens when a signaling molecule binds to a ligand-gated ion channel?

The ion channel opens, allowing specific ions to pass through the membrane.

The ion channel triggers the release of neurotransmitters into the synaptic cleft.

The ion channel activates a G-protein coupled receptor pathway.

The ion channel closes, preventing any ions from passing through the membrane.

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Verified step by step guidance

Understand the basic function of ligand-gated ion channels: These channels are a type of membrane protein that open or close in response to the binding of a signaling molecule, known as a ligand.

Identify the role of the ligand: When a signaling molecule binds to the ligand-gated ion channel, it causes a conformational change in the channel structure.

Recognize the effect of the conformational change: This change typically results in the opening of the channel, allowing specific ions to pass through the membrane, altering the ion concentration inside and outside the cell.

Consider the physiological outcome: The movement of ions can lead to various cellular responses, such as changes in membrane potential, which can trigger further cellular activities like the release of neurotransmitters.

Differentiate from other pathways: Unlike G-protein coupled receptor pathways, ligand-gated ion channels directly mediate ion flow without involving secondary messenger systems.