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

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

Anatomy & Physiology

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

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Multiple Choice

Which muscle is named for its straight muscle fiber orientation?

Orbicularis oculi

Deltoid

Rectus abdominis

Biceps brachii

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Verified step by step guidance

Understand the naming conventions of muscles: Muscles are often named based on their shape, size, location, fiber orientation, or function. For example, 'rectus' means 'straight' in Latin, indicating the orientation of muscle fibers.

Analyze the options provided: Orbicularis oculi refers to a circular muscle around the eye ('orbicularis' means circular). Deltoid refers to a triangular-shaped muscle ('delta' means triangle). Biceps brachii refers to a muscle with two heads ('bi' means two, and 'ceps' means heads).

Focus on the term 'rectus abdominis': The name 'rectus' indicates straight muscle fibers, and 'abdominis' refers to the abdominal region. This muscle runs vertically along the abdomen, with fibers oriented in a straight direction.

Compare the fiber orientation of the rectus abdominis with the other options: Orbicularis oculi has circular fibers, deltoid has converging fibers, and biceps brachii has fibers arranged in a fusiform pattern. Only rectus abdominis has straight fibers.

Conclude that the muscle named for its straight fiber orientation is the rectus abdominis, based on the meaning of 'rectus' and its anatomical structure.