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 best describes the tunica intima in blood vessels?

The outermost layer consisting of connective tissue

The middle layer made of smooth muscle

A layer of elastic cartilage

The innermost layer composed of endothelium

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Verified step by step guidance

Understand the structure of blood vessel walls, which are composed of three layers: the tunica intima (innermost), tunica media (middle), and tunica externa (outermost).

Recall that the tunica intima is the innermost layer of a blood vessel and is in direct contact with the blood flowing through the vessel.

Note that the tunica intima is primarily composed of a single layer of endothelial cells, which provide a smooth surface to reduce friction for blood flow, and may also include a thin layer of connective tissue and an internal elastic membrane in some vessels.

Eliminate incorrect options by matching the descriptions provided: the outermost layer (connective tissue) refers to the tunica externa, the middle layer (smooth muscle) refers to the tunica media, and elastic cartilage is not a component of blood vessel walls.

Conclude that the correct description of the tunica intima is 'The innermost layer composed of endothelium,' as it matches the anatomical structure and function of this layer.