1. What are the three kinds of muscles? 1. What are muscles made of? 3. Which muscles can you control? 4. How are muscles connected to bones?

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Here are the answers to your questions about muscles:

1. **Three Kinds of Muscles:**
   - **Skeletal Muscle:** These muscles are attached to bones and are responsible for voluntary movements. They are striated in appearance and can be controlled consciously.
   - **Cardiac Muscle:** Found only in the heart, cardiac muscle is responsible for pumping blood throughout the body. It is striated like skeletal muscle but operates involuntarily and has a unique structure that allows it to contract rhythmically.
   - **Smooth Muscle:** This type of muscle is found in the walls of hollow organs (like the intestines and blood vessels) and is responsible for involuntary movements. Smooth muscle is non-striated and operates without conscious control.

2. **What Muscles Are Made Of:**
   - Muscles are primarily made of muscle fibers, which are long, cylindrical cells. These fibers contain myofibrils, which are further composed of sarcomeres—the basic contractile units of muscle. Sarcomeres contain proteins such as actin and myosin that interact to produce muscle contraction. Additionally, muscles contain connective tissue, blood vessels, and nerves.

3. **Muscles You Can Control:**
   - The muscles you can control are primarily **skeletal muscles**. These muscles are under voluntary control, meaning you can consciously decide to contract or relax them. Examples include the muscles in your arms, legs, and face.

4. **How Muscles Are Connected to Bones:**
   - Muscles are connected to bones via **tendons**, which are strong, fibrous connective tissues. When a muscle contracts, it pulls on the tendon, which in turn pulls on the bone, resulting in movement. The attachment points of tendons to bones are called insertion (the point where the muscle attaches to the bone that moves) and origin (the point where the muscle attaches to the stationary bone).
1. **Three Kinds of Muscles:** - **Skeletal Muscle:** Attached to bones, used for voluntary movements. - **Cardiac Muscle:** In the heart, pumps blood involuntarily. - **Smooth Muscle:** In organs like intestines and blood vessels, operates involuntarily. 2. **What Muscles Are Made Of:** - Muscle fibers with myofibrils, sarcomeres, actin, myosin, connective tissue, blood vessels, and nerves. 3. **Muscles You Can Control:** - Skeletal muscles, which you can move consciously. 4. **How Muscles Are Connected to Bones:** - Through tendons that attach muscles to bones, allowing movement when muscles contract.

1. What are the three kinds of muscles? 1. What are muscles made of? 3. Which muscles can you control? 4. How are muscles connected to bones?

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