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

Sliding Filament Theory and the Sacromere

Anatomy & Physiology

9. Muscle Tissue

Sliding Filament Theory and the Sacromere

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

What does the sliding filament model describe during muscle contraction?

The breakdown of ATP into ADP and phosphate.

The interaction between actin and myosin filaments leading to muscle shortening.

The generation of electrical impulses in the motor neuron.

The process of calcium ions being released from the sarcoplasmic reticulum.

Previous problemNext problem

Verified step by step guidance

Begin by understanding the sliding filament model, which is a fundamental concept in muscle physiology describing how muscles contract.

Recognize that muscle contraction involves the interaction between two types of protein filaments: actin and myosin.

During contraction, myosin heads bind to actin filaments, forming cross-bridges. This is powered by the hydrolysis of ATP into ADP and inorganic phosphate, which provides the energy for the myosin heads to pull the actin filaments inward.

This pulling action causes the sarcomere, the functional unit of a muscle fiber, to shorten, leading to overall muscle shortening and contraction.

Calcium ions play a crucial role by binding to troponin, which causes a conformational change in tropomyosin, exposing binding sites on actin for myosin, thus facilitating the sliding filament process.