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

When the psoas major contracts, the thigh is ______.

extended at the knee

flexed at the hip

rotated laterally

abducted at the hip

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Verified step by step guidance

Step 1: Begin by identifying the psoas major muscle. The psoas major is a deep muscle located in the lumbar region of the spine and extends to the femur. It is part of the iliopsoas group, which plays a key role in hip movement.

Step 2: Understand the primary function of the psoas major. This muscle is responsible for flexing the thigh at the hip joint, which means it brings the thigh closer to the torso. This action is crucial for movements like walking, running, and sitting.

Step 3: Analyze the options provided in the question. The options include: 'extended at the knee,' 'flexed at the hip,' 'rotated laterally,' and 'abducted at the hip.' Compare each option to the known function of the psoas major.

Step 4: Eliminate incorrect options. The psoas major does not extend the knee (this is the function of the quadriceps), rotate the thigh laterally (this is performed by muscles like the piriformis), or abduct the thigh at the hip (this is done by muscles like the gluteus medius).

Step 5: Conclude that the correct action of the psoas major when it contracts is 'flexed at the hip,' as this aligns with its anatomical function of bringing the thigh closer to the torso.