The muscular system. Three types of muscle Smooth muscle is an involuntary muscle. Example –...

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Skeletal muscle contraction Muscles are arranged in opposing pairs. Muscle fibers consist on myofibrils. Myofibrils are made of actin and myosin (protein) subunits. A sarcomere is the functional unit of a muscle.

Transcript of The muscular system. Three types of muscle Smooth muscle is an involuntary muscle. Example –...

The muscular system

Three types of muscle

• Smooth muscle is an involuntary muscle. Example – digestive system

• Cardiac muscle is an involuntary muscle found in the heart. Has pronounced striations.

• Skeletal muscle are voluntary muscles that are used to move bones.

Skeletal muscle contraction

• Muscles are arranged in opposing pairs.• Muscle fibers consist on myofibrils.• Myofibrils are made of actin and myosin

(protein) subunits.• A sarcomere is the functional unit of a muscle.

How do muscles move?

• Muscles move by contracting and then relaxing.

• Sliding filament theory is used to explain muscle contraction.

• http://bcs.whfreeman.com/thelifewire/content/chp47/4702001.html

• How is a muscle contraction triggered?

Muscle fiber