Muscle Tissue

Question 1

muscle CT hierarchy

Answer 1

epimysium –> perimysium –> endomysium
epi = around whole muscle - dense irregular
peri - around fascicle = dense irregular
endo = around the cell. - areolar (just blood and nerves around fibre - mostly reticular fibres)

Question 2

structure of smooth muscle

Answer 2

intermediate filaments attach to dense bodies in criss cross manner, and rotate to “contract
actin attach to dense bodies
myosin attached to middle of actin
dense bodies made of actinin

Question 3

structure of skeletal muscle

Answer 3

striated
sarcomere:
Z discs between sarcomeres - mad of actinin
A band = all of myosin (incl. some actin)
H zone = only thick
I Band = only thin
M line = middle of sarcomere
titin links Z and M together

Question 4

where are intercalated discs found and what do they have

Answer 4

cardiac muscle
desmosomes - bond to resist pulling apart - lots of contractions
gap junctions - electrical conduction/communication
purkinje fibres - specialised muscle cells with special connexins.

Question 5

muscle structure hierarchy

Answer 5

myosin
myofilaments
myofibrils
myocytes
fascicle
muscle