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

When you bend forward at the waist, which primary muscle movement are you performing?

Rotation

Abduction

Flexion

Extension

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Verified step by step guidance

Understand the anatomical terms: Flexion refers to a movement that decreases the angle between two body parts, typically bending a joint. Extension is the opposite, increasing the angle between body parts. Rotation involves turning a body part around its axis, and abduction refers to moving a limb away from the midline of the body.

Identify the action described in the problem: Bending forward at the waist involves decreasing the angle between the torso and the legs, which aligns with the definition of flexion.

Consider the primary muscles involved: The rectus abdominis and other abdominal muscles are primarily responsible for flexion at the waist. These muscles contract to bring the torso forward.

Rule out other options: Rotation involves twisting, which is not described in the problem. Abduction refers to moving limbs away from the midline, which does not apply to bending forward. Extension would involve straightening or increasing the angle, which is the opposite of bending forward.

Conclude that the correct movement being performed when bending forward at the waist is flexion, based on the anatomical definitions and muscle actions.