Muscles.

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Presentation transcript:

Muscles

Types of Muscle Smooth - involuntary Skeletal - voluntary Cardiac - involuntary

Smooth Muscle Involuntary Lines digestive system Lines blood vessels Contracts bladder Contracts uterus Few nuclei, no striations Movements involve many muscles at a time

Skeletal Muscle Under voluntary control Moves arms, legs, head Allows us to change body position, move Produces most of body heat Many striations, many nuclei Pull on bone

Structure of Skeletal Muscle Draw figure 37.10 in your notes here. Muscles are made of individual bundles. Each bundle is enclosed by a sarcolemma Within each sarcolemma are many sarcomeres

Skeletal Muscle Structure

Skeletal Muscle (cont.) Each sarcomere is bounded by two Z lines Each sarcomere is made of actin and myosin strands

Sliding Filament Theory Basic theory of muscle contraction. Two filaments, actin & myosin, interact within the sarcomere Length of A band doesn’t change. I-band and H-zone shorten during contraction. Filaments slide past each other but do not shorten themselves.

Cardiac Muscle Found only in heart Striated like skeletal muscle Involuntary like smooth muscle Pushes blood out of the heart