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 Heart2h 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

19. The Blood Vessels

Capillaries

Anatomy & Physiology

19. The Blood Vessels

Capillaries

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Multiple Choice

Which scenario results in constriction of arterioles & precapillary sphincters in mesenteric capillary beds?

Increased metabolic activity in mesenteries.

Decreased pH level near mesenteries.

Low $O_2$ concentration in mesenteries.

A greater need for blood elsewhere in the body.

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Verified step by step guidance

Understand that arterioles and precapillary sphincters regulate blood flow into capillary beds by constricting or dilating.

Recognize that increased metabolic activity, decreased pH, and low oxygen levels typically signal a need for more blood flow to deliver oxygen and remove waste products, leading to dilation rather than constriction.

Consider the scenario where blood is needed elsewhere in the body, such as during exercise or in response to a fight-or-flight situation.

In such cases, the body prioritizes blood flow to essential organs and muscles, leading to constriction of arterioles and precapillary sphincters in less critical areas like the mesenteric capillary beds.

This constriction helps redirect blood to areas with a greater immediate need, ensuring efficient distribution of oxygen and nutrients throughout the body.