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

4. Tissues & Histology

Introduction to Muscle Tissue

Anatomy & Physiology

4. Tissues & Histology

Introduction to Muscle Tissue

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Multiple Choice

Stimulus frequency affects the sarcoplasmic concentration of which of the following?

Sodium ions

ATP

Glucose

Calcium ions

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Verified step by step guidance

Understand the role of calcium ions in muscle contraction: Calcium ions are stored in the sarcoplasmic reticulum of muscle cells and are released into the sarcoplasm when a stimulus triggers an action potential.

Learn how stimulus frequency affects calcium ion concentration: When the frequency of stimuli increases, the sarcoplasmic reticulum releases calcium ions repeatedly, leading to a higher concentration of calcium ions in the sarcoplasm.

Recognize the physiological effect of increased calcium ion concentration: Elevated calcium levels in the sarcoplasm enhance the binding of calcium to troponin, which facilitates the interaction between actin and myosin, resulting in stronger or sustained muscle contractions.

Eliminate the incorrect options: Sodium ions are involved in generating action potentials, ATP is used for energy during muscle contraction, and glucose is a substrate for ATP production, but none of these directly relate to sarcoplasmic concentration changes due to stimulus frequency.

Conclude that calcium ions are the correct answer: Calcium ions are directly affected by stimulus frequency, as their release and reuptake by the sarcoplasmic reticulum are regulated during muscle contraction.