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

Introduction to the Endocrine System

Anatomy & Physiology

16. The Endocrine System

Introduction to the Endocrine System

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Multiple Choice

Increased levels of T3 and T4 will result in which of the following effects?

Reduced body temperature

Decreased heart rate

Weight gain

Increased metabolic rate

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Verified step by step guidance

Step 1: Begin by understanding the role of T3 (triiodothyronine) and T4 (thyroxine), which are thyroid hormones. These hormones are critical regulators of metabolism and influence various physiological processes in the body.

Step 2: Recall that T3 and T4 increase the basal metabolic rate (BMR). This means they enhance the rate at which the body uses energy, leading to increased oxygen consumption and heat production.

Step 3: Analyze the options provided in the problem. Increased levels of T3 and T4 would not reduce body temperature; instead, they increase heat production due to higher metabolic activity. Similarly, they do not decrease heart rate; they typically increase it as part of their stimulatory effects on the cardiovascular system.

Step 4: Consider the effect of T3 and T4 on weight. Increased metabolic rate generally leads to weight loss, not weight gain, as the body burns more calories. This eliminates the option of weight gain.

Step 5: Conclude that the correct effect of increased levels of T3 and T4 is an increased metabolic rate, as this aligns with their primary physiological function of enhancing energy expenditure and overall metabolism.