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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

11. Nervous Tissue and Nervous System

Ions - Sodium and Potassium

Anatomy & Physiology

11. Nervous Tissue and Nervous System

Ions - Sodium and Potassium

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Multiple Choice

Which is the most abundant cation in the extracellular fluid (ECF)?

Sodium (Na+)

Magnesium (Mg2+)

Potassium (K+)

Calcium (Ca2+)

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Verified step by step guidance

Understand the concept of extracellular fluid (ECF): The ECF is the fluid environment outside the cells, which includes interstitial fluid, blood plasma, and transcellular fluid.

Identify the role of cations in the ECF: Cations are positively charged ions that play crucial roles in maintaining fluid balance, nerve transmission, and muscle function.

Review the common cations present in the ECF: The primary cations in the ECF are sodium (Na+), magnesium (Mg2+), potassium (K+), and calcium (Ca2+).

Consider the concentration of each cation in the ECF: Sodium (Na+) is known to be the most abundant cation in the ECF, playing a key role in osmoregulation and nerve impulse transmission.

Conclude that sodium (Na+) is the most abundant cation in the extracellular fluid, based on its high concentration and essential physiological functions.