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Red,smallest, large amt of myoglobin, many mitochondria, many capillaries, aerobic cellular respiration, postural muscles(neck), maintaining posture and aerobic endurance


Pink, intermediate in size large amount of myoglobin, many mitochondria, many capillaries, aerobic and anaerobic respiration, lower limb muscles, walking and sprinting.


White, most "powerful" , largest in diameter, small amount of myoglobin, few mitochondria, few capillaries, anaerobic respiration, (15 sec or less-lift and put down), rapid intense movements of short duration

Skeletal muscle

endomysium/ perimysium and epimysium, sarcomere is contractile protein, abundant SR, t-tubules, NO JUNCTION between fibers, no autorhytmicity, source of ca+2 for contraction is SR, troponin and tropomyosin, fast (speed) of contraction, voluntary, contraction regulated by ACh -if none no contraction, regeneration is limited via satellite cells

cardiac muscle

endomysium only, sarcomere, intercalated disks contain gap junctions and desmosomes(junction between fibers), autorhythmicity, SR and interstitial fluid for source of contraction, troponin and tropomyosin, moderate speed of contraction, involuntary, ACh and norepinephrine released by autonomic motor neurons, regeneration is limited under certain conditions.

Smooth muscle

NO sacromere, NO t-tubules, NO troponin/tropomyosin, endomysium only, SLOWLY contracts, autorhythmicity, SR and interstital fluid-source of ca+2 for contraction, CALMODULIN AND MYOSIN LIGHT CHAIN KINASE-for regulatory proteins, ACh and norepinephrine regulate contraction, more generation than other two types.

Skeletal muscles develop from?

Mesoderm of somites

cardiac muscles develop from?

meodermal cells

smooth muscles develop from?

mesodermal cells

Motor unit recrited in the following order......


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