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

10. Muscles

Muscle Actions

Anatomy & Physiology

10. Muscles

Muscle Actions

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

The force of a muscle contraction is not affected by which of the following?

the type of neurotransmitter released at the neuromuscular junction

the length of the muscle fibers at the start of contraction

the number of motor units activated

the color of the muscle

Previous problemNext problem

Verified step by step guidance

Understand the factors that influence muscle contraction force: Muscle contraction force is affected by physiological and anatomical factors such as the length-tension relationship, the number of motor units activated, and the type of neurotransmitter released at the neuromuscular junction.

Analyze the role of neurotransmitters: Neurotransmitters like acetylcholine are essential for initiating muscle contraction by transmitting signals from the motor neuron to the muscle fiber at the neuromuscular junction.

Examine the length-tension relationship: The length of muscle fibers at the start of contraction determines the overlap between actin and myosin filaments, which directly impacts the force generated during contraction.

Evaluate the number of motor units activated: Motor units consist of a motor neuron and the muscle fibers it innervates. Activating more motor units increases the force of contraction.

Consider the color of the muscle: Muscle color is determined by the presence of myoglobin and the type of muscle fibers (e.g., red or white fibers). While muscle color is related to endurance and metabolic properties, it does not directly affect the force of contraction.