What are some different types of muscles?

Skeletal muscles:

- Attached to bones

- Voluntary movements

- Controlled by the somatic nervous system

Smooth muscles:

- Found in internal organs

- Involuntary movements

- Controlled by the autonomic nervous system

Cardiac muscles:

- Found in the heart

- Involuntary movements

- Controlled by the cardiac conduction system

Sphincter muscles:

- Circular muscles that control the opening and closing of body passages

- Found in the gastrointestinal tract, urinary tract, and respiratory tract

Extensor muscles:

- Muscles that straighten a joint

- Example: Quadriceps muscle in the thigh

Flexor muscles:

- Muscles that bend a joint

- Example: Biceps muscle in the upper arm

Abductor muscles:

- Muscles that move a limb away from the midline of the body

- Example: Deltoid muscle in the shoulder