Muscles
Humans have three different types of muscle:
Skeletal Muscle - This type of muscle is attached to bone, mostly in the legs, arms, abdomen, chest, neck, and face. These muscles hold the skeleton together, give the body shape, and help it with everyday movements. (They are also known as voluntary muscles because you can control their movement).
Smooth Muscle - Generally, we can't consciously control our smooth muscles; rather, they're controlled by the nervous system automatically. Examples of smooth muscles are the walls of the stomach and intestines, which help break up food and move it through the digestive system.
Cardiac Muscle - This type of muscle is found in the heart. The walls of the heart's chambers are composed almost entirely of muscle fibres. Cardiac muscle is also an involuntary type of muscle. It's rhythmic, powerful contractions force blood out of the heart as it beats.
Skeletal Muscles are the muscles that we commonly talk about. Here are some of the main muscles in the body.
Muscle | Location |
Abdominals | Front torso |
Obliques | Side torso |
Pectoralis | Chest |
Latissimus Dorsi | Back |
Deltoid | Shoulder |
Biceps | Upper front arm |
Triceps | Upper back arm |
Gluteus | Bottom |
Quadriceps | Upper front leg |
Hamstrings | Upper back leg |
Adductor | Inner thigh |
Abductor | Outer thigh |
Calf | Lower back leg |