Histology Of Muscle Flashcards
If additional skeletal muscle cells are needed, what occurs
Satellite cells can differentiate into muscle cell
Can provide additional mayo nuclei to parent muscle cell
How does the skeletal muscle contract as a unit
Connective tissue collagen transmit mechanical forces across muscle
How do you identify skeletal muscle
Long, cylindrical, multinucleated that are located at periphery under sarcolemma
Striated
No branching
What is H zone, A&I band, sarcomere
H zone- just myosin
A band- whole myosin with overlapping actin
I band- Just actin
Sarcomere- between one z line and another
What is skeletal muscle type 1
Red oxidative Energy from aerobic oxidative phosphorylation Slow, continuous contractions Low glycolysis Less force
What is skeletal muscle type 2
White Anaerobic Glycolysis for energy Rapid contractions - a lot of force Fatigue easily
What does differentiation of types of muscles depend on
Freq. of motor innervation
Type of fibre of motor unit
Muscle conform morphology to innervating nerve fibre
Describe the organization of muscle
Endomysium/ sarcolemma over muscle fibre
Perimysium over fascicle
Epimysium over skeletal muscle
How do you identify cardiac muscle
Shorter cells
Branched
Irregularly shaped single central nucleus
Why can’t cardiac muscle regenerate
No satellite cells
What do the purkinje fibers do
Coordinate inherent cardiac rhythm
What do the intercalated discs do
Interface with adj muscle cells to retain structural integrity and ionic continuity
How is cardiac muscle vascularised
Endomysium rich in capillaries
How do you identify smooth muscle
Elongated central nucleus
No cross striations
Spindle shaped
No branching
Ho does concerted action occur in smooth muscle
Basal lamina and reticular fibers combine forces for concerted action
