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

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

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Multiple Choice

How would an elevated level of thyroid hormone in the body most likely affect skeletal muscles?

It would decrease the metabolic activity of skeletal muscles, resulting in muscle atrophy.

It would increase the metabolic activity of skeletal muscles, potentially leading to muscle weakness over time.

It would cause skeletal muscles to become less responsive to nerve stimulation.

It would have no significant effect on skeletal muscle function.

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Verified step by step guidance

Step 1: Begin by understanding the role of thyroid hormones in the body. Thyroid hormones, primarily thyroxine (T4) and triiodothyronine (T3), regulate metabolism and energy production in cells, including skeletal muscle cells.

Step 2: Recognize that elevated levels of thyroid hormones (hyperthyroidism) increase the metabolic rate of cells. This heightened activity can lead to increased energy demands and faster turnover of cellular components in skeletal muscles.

Step 3: Consider the consequences of sustained elevated metabolic activity in skeletal muscles. Over time, this can result in muscle weakness due to the excessive breakdown of proteins and insufficient repair or recovery processes.

Step 4: Evaluate the incorrect options. For example, thyroid hormones do not decrease metabolic activity or cause muscle atrophy directly; instead, they increase activity. Similarly, thyroid hormones do not make muscles less responsive to nerve stimulation, as their primary effect is metabolic rather than neurological.

Step 5: Conclude that the most likely effect of elevated thyroid hormone levels on skeletal muscles is increased metabolic activity, which can lead to muscle weakness over time due to the imbalance between energy demands and repair mechanisms.