🌱 PLANT CELL

A plant cell has several important parts. Each part has a special function that helps the cell work properly.

🧱 Cell Wall

• Gives the cell support and protection.

• Helps keep the cell’s shape.

🚪 Cell Membrane

🧫 animal Cell

A cell is the basic unit of life. Our body is made of many cells.

🔬 Main Parts

• Cell membrane — Controls what goes in and out.

• Cytoplasm — Where many cell activities happen.

• Nucleus — Controls the cell and stores DNA.

💪 Muscle Contraction and Relaxation

💪 Muscle Contraction

Muscle contraction is the process in which a muscle becomes shorter and thicker to create movement. It starts when the brain sends a signal through a nerve to the muscle. The muscle then begins to work, and tiny proteins called actin and myosin slide over each other. This makes the muscle shorten. The shortened muscle pulls the tendon, which pulls the bone, causing movement.

😌 Muscle Relaxation

Muscle relaxation is the process in which the muscle returns to its normal length after movement. The brain stops sending the signal, so the muscle stops pulling. The muscle fibers return to their normal position, the tendon stops pulling the bone, and the muscle is ready for the next movement.

🌟 Simple Process

muscles

Muscles are soft tissue. Muscles produce movement. They work by contracting and relaxing.

types of muscles

• Skeleton muscles.

• smooth muscles.

• cardiac muscles.