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

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Spine extensions primarily develop the strength and flexibility of which muscle group?

Erector spinae muscles

Biceps brachii

Quadriceps femoris

Pectoralis major

Previous problemNext problem

Verified step by step guidance

Step 1: Understand the movement described in the problem. Spine extensions involve bending backward or straightening the spine from a flexed position, which requires the activation of muscles along the back.

Step 2: Identify the muscle group responsible for spine extensions. The erector spinae muscles are a group of muscles located along the vertebral column that are primarily responsible for extending and stabilizing the spine.

Step 3: Eliminate the incorrect options. The biceps brachii are located in the upper arm and are responsible for flexing the elbow, not spine extension. The quadriceps femoris are located in the thigh and are responsible for extending the knee. The pectoralis major is located in the chest and is responsible for movements of the shoulder joint.

Step 4: Confirm the correct answer. The erector spinae muscles are the correct muscle group involved in spine extensions, as they are anatomically positioned to perform this function.

Step 5: Relate the concept to practical applications. Strengthening the erector spinae muscles through spine extension exercises can improve posture, spinal stability, and overall back health.