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

Blood vessel size is directly and indirectly controlled by the:

skeletal system

endocrine system

integumentary system

digestive system

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Verified step by step guidance

Step 1: Begin by understanding the role of blood vessel size regulation in the body. Blood vessel size is controlled by processes such as vasodilation (widening of blood vessels) and vasoconstriction (narrowing of blood vessels), which are essential for maintaining blood pressure and ensuring proper blood flow to tissues.

Step 2: Analyze the systems listed in the problem: skeletal system, endocrine system, integumentary system, and digestive system. Consider which system has direct or indirect control over blood vessel size.

Step 3: Recall that the endocrine system plays a key role in regulating blood vessel size through hormones. For example, hormones like adrenaline (epinephrine) and norepinephrine, released by the adrenal glands, can cause vasoconstriction or vasodilation. Additionally, other hormones like antidiuretic hormone (ADH) and angiotensin II influence blood vessel size and blood pressure.

Step 4: Evaluate the other systems mentioned. The skeletal system provides structural support but does not directly regulate blood vessel size. The integumentary system (skin) may influence blood vessel size indirectly through thermoregulation, but it is not the primary controller. The digestive system is involved in nutrient absorption and does not directly regulate blood vessel size.

Step 5: Conclude that the endocrine system is the correct answer because it directly controls blood vessel size through hormonal signaling, which affects vasodilation and vasoconstriction.