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

Which of the following is an effect of thyroxine and triiodothyronine released by the thyroid gland?

Decrease in heart rate

Suppression of protein synthesis

Increase in basal metabolic rate

Reduction in body temperature

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Verified step by step guidance

Step 1: Begin by understanding the role of thyroxine (T4) and triiodothyronine (T3), which are hormones produced by the thyroid gland. These hormones are critical for regulating metabolism, growth, and development in the body.

Step 2: Recognize that thyroxine (T4) and triiodothyronine (T3) primarily act to increase the basal metabolic rate (BMR). BMR refers to the amount of energy expended by the body at rest to maintain vital functions such as breathing and circulation.

Step 3: Analyze the physiological effects of increased BMR caused by T4 and T3. These include enhanced oxygen consumption, increased heat production (thermogenesis), and stimulation of protein synthesis, which supports growth and repair processes.

Step 4: Evaluate the incorrect options. For example, a decrease in heart rate is not associated with thyroid hormones; instead, they tend to increase heart rate and cardiac output. Similarly, suppression of protein synthesis contradicts the anabolic effects of T4 and T3. Reduction in body temperature is also incorrect, as thyroid hormones increase thermogenesis.

Step 5: Conclude that the correct effect of thyroxine and triiodothyronine is an increase in basal metabolic rate, as this aligns with their primary function of stimulating metabolism and energy production in the body.