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Luokat: Kaikki - muscles - skeletal - contraction - movement

jonka Brooke Caruso 6 vuotta sitten

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Muscles

The human body comprises over 600 muscles, which play critical roles in movement, posture, and heat production. Muscle contractions occur through tension-generating sites within fibers, with types of contractions being concentric when muscles shorten and eccentric when they lengthen.

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Muscles

Produce Heat

Contractions

if the muscle length lengthens, the contraction is eccentric

If the muscle length shortens, the contraction is concentric

activation of tension-generating sites within muscle fibers.

length and tension

Fibers

600+ muscles in the body

Helps Body Movement

Help Posture

3 Main Types

Cardiac

Located in the walls of the heart. appear striated, and are under involuntary control.

Skeletal

made up of bundles of individual muscle fibers called myocytes. occur in muscles which are attached to the skeleton. They are striated in appearance and are under voluntary control. Contractions are neurogenic

Smooth

located in walls of hollow visceral organs. Appear spindle-shaped, under involuntary control. Present in the eyes. produce their own connective tissue. Smooth muscle contraction relies on the presence of Ca++ ions