Muscle
- 类型:时尚购物
- 大小:97.39MB
- 语言:简体中文
- 厂商:Muscle
- 更新:2026-02-12 08:17:26
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详情介绍
**Muscles: Structure and Function** Muscles are specialized tissues in the body responsible for movement, stability, and heat production. They are composed of muscle fibers, which contract and relax to generate force. There are three main types of muscles: 1. **Skeletal Muscles**: Attached to bones via tendons, these voluntary muscles enable movement of the body. They are striated and controlled consciously. 2. **Smooth Muscles**: Found in the walls of internal organs (e.g., stomach, blood vessels), these involuntary muscles regulate processes like digestion and blood flow. They are non-striated and operate autonomously. 3. **Cardiac Muscles**: Located in the heart, these involuntary muscles pump blood throughout the body. They are striated and have a unique ability to contract rhythmically without external stimulation. Muscles function through the sliding filament mechanism, where actin and myosin filaments interact to produce contractions. Proper nutrition, exercise, and rest are essential for maintaining muscle health and functionality.
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