Types of Muscles: Skeletal, Smooth & Cardiac Explained
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
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