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Characteristic of myoblast (Skeletal, smooth, and cardiac muscle functions)

Skeletal, Smooth, and Cardiac muscle functions
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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
Smooth muscle size
Medium. 2-10 um in diameter. Several hundred um in length.
Cardiac muscle size
Small. 15 um in diameter. 100 um in length
Skeletal muscle cross striping
Obvious striations; typical sarcomere
Smooth muscles cross striping
No striations; no sarcomere
Cardiac muscle cross striping
Striations; sarcomere
Presence of myofibrils composed of sarcomeres
Goes from z-line to z-line
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
Skeletal muscle location
Attached to bones or to skin
Smooth muscle location
Walls of hollow organs, such as the stomach, respirator tubes, bladder, blood vessels, and uterus
Cardiac muscle location
Walls of the heart (not part of blood vessels, just heart)
Innervation
Nerve supply
Skeletal muscle innervation
1 nerve/cell (per fiber); gradient of strength
Smooth muscle innervation
2 types:
Single unit muscle - not all cells act together
Multiunit muscle - all cells; all or nothing response
Cardiac muscle innervation
Not all cells are innervated; all or nothing contraction
Skeletal muscle blood supply
1 artery and vein/cell blood supply
Smooth muscle blood supply
Sparse blood supply
Cardiac muscle blood supply
1:1 blood supply
Slow oxidative
rich in mitochondria and myoglobin; split ATP at a slow rate
Fast oxidative
have a fast contraction velocity and are resistant to fatigue
Fast glycolytic
relatively few mitochondria, relatively few blood capillaries and large amounts
Skeletal muscle strength of contraction
all three strength; mixture of all three and genetically varying
Smooth muscle strength of contraction
Slow
Cardiac muscle strength of contraction
middle
Skeletal muscle energy requirement
ATP with or without oxygen
Smooth muscle energy requirement
ATP with oxygen
Cardiac muscle energy requirement
ATP with oxygen (little need for glycogen)
Skeletal muscle fatigue ability
Depends on type of muscle that is most abundant in individual (fast/slow oxidative or fast glycolytic)
Smooth muscle fatigue ability
Resistant to being tired
Cardiac muscle fatigue ability
Resistant to being tired
Skeletal muscle voluntary or involuntary control
Voluntary
Smooth muscle voluntary or involuntary control
involuntary
Cardiac muscle voluntary or involuntary control
involuntary
Skeletal muscle connective tissue
Epimyisum, perimysium, and endomysium
Smooth muscle connective tissue
Endomyosium
Cardiac muscle connective tissue
Endomyisum attached to fibrous skeleton of the heart
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
Skeletal muscle elaborate sarcoplasmic reticulum
Yes, has elaborate sarcoplasmic reticulum
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
Skeletal muscle presence of gap junctions
No presence of gap junctions
Smooth muscle presence of gap junctions
Yes presence of gap junctions, in a single unit muscle but not in multi.
Cardiac muscle presence of gap junctions
Yes presence of gap junctions at intercalated discs
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
Cardiac muscle source of calcium for calcium pulse
SR and extra cellular fluid are the source of calcium for calcium pulse