Muscles
Muscles are soft tissues in the human body made up of special cells called muscle fibers that can contract and relax. They help the body move by pulling on bones through tendons. Muscles are elastic, which means they can contract without breaking and then return to their original shape. There are over 600 muscles in the human body, and together with bones and joints, they allow all kinds of body movements. Muscles also protect our organs and help maintain posture and body stability. They can be divided into three main types: skeletal muscles, which are attached to bones and help with voluntary movements; smooth muscles, found inside organs and responsible for involuntary actions; and cardiac muscles, which are found only in the heart and control heartbeat. The nervous system directs muscles to contract and relax so we can move and perform tasks. Muscle contractions convert chemical energy into mechanical energy to generate force and power. Some major muscles include the biceps, triceps, quadriceps, abs, and glutes. Muscles also play important roles in maintaining body temperature and storing nutrients.
Muscles are soft parts of the body that help us move.
They work by contracting (pulling) and relaxing.
Muscles connect to bones through tendons.
The nervous system tells muscles when to move.
Muscles protect our important organs.
There are over 600 muscles in the human body.
Muscles also help keep our posture straight.
Some muscles work without us thinking, like the heart.
Muscles produce heat to keep our body warm.
There are three types of muscles: skeletal, smooth, and cardiac.