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Skeletal muscle shape
Single, very long cylindrical, multinucleated cells with obvious striations (nucleus at periphery); lots of mitochondria
Smooth muscle shape
Single, spindle shaped cells (thick in the middle and tapered at the end), uninucleated (in the center); little mitochondria; dense bodies
Cardiac muscle shape
Branching chains of cells, uni or bi nucleated; striations; nucleus in center; lots of mitochondria; intercalated discs - 2 parts: Gap junctions and desmosomes
Skeletal muscle size
Big. 100 um in diameter. Several cm in length. Myoblast fused together creates its length
Skeletal muscle presence of myofibrils composed of sarcomeres
Yes presence of myofibrils composed of sarcomeres
Smooth muscle presence of myofibrils composed of sarcomeres
No presence of myofibrils composed of sarcomeres, but actin and myosin filaments are present throughout (does not have a sarcomere)
Cardiac muscle presence of myofibrils composed of sarcomeres
Yes presence of myofibrils composed of sarcomeres, but myofibrils are of irregular thickness
Smooth muscle location
Walls of hollow organs, such as the stomach, respirator tubes, bladder, blood vessels, and uterus
Smooth muscle innervation
Single unit muscle - not all cells act together
Multiunit muscle - all cells; all or nothing response
Skeletal muscle strength of contraction
all three strength; mixture of all three and genetically varying
Skeletal muscle fatigue ability
Depends on type of muscle that is most abundant in individual (fast/slow oxidative or fast glycolytic)
Skeletal muscle are there presence of t-tubules and site of invagination
Yes, presence of t-tubules and site of invagination at A-I junctions
Smooth muscle are there presence of t-tubules and site of invagination
No, presence of t-tubules and site of invagination caveoli among the sarcolema
Cardiac muscle are there presence of t-tubules and site of invagination
Yes presence of t-tubules and site of invagination at z-lines, larger diameter than those of skeletal muscle
Smooth muscle elaborate sarcoplasmic reticulum
Equivalent to cardiac muscle; some SR contacts the sarcolemma
Cardiac muscle elaborate sarcoplasmic reticulum
Less elaborate sarcoplasmic reticulum than skeletal muscle; scant terminal cisternae
Smooth muscle presence of gap junctions
Yes presence of gap junctions, in a single unit muscle but not in multi.
Skeletal muscle source of calcium for calcium pulse
Sarcoplasmic reticulum contains source of calcium for calcium pulse
Smooth muscle source of calcium for calcium pulse
SR and from extracellular fluid are the source of calcium for calcium pulse
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