Structure of Muscle Flashcards
unit 2
what are the 3 types of muscle
smooth, cardiac, and skeletal
is smooth m. striated or nonstriated
nonstriated
is smooth m autonomic or somatic NS
autonomic NS
is cardiac m. striated or nonstriated
striated
is cardiac m. autonomic or somatic NS
autonomic NS
is skeletal m. striated or nonstriated
striated
is skeletal m. autonomic or somatic NS
somatic NS
what muslce types are multinucleated vs mononucleated
cardiac and skeletal m. are multinucleated. whereas smooth muscle is mononucleated
what is the contractile unit
sarcomere
a bunch of sarcomeres make up what
myofibril
a bunch of myofibrils make up what
muscle fiber
a bunch of muscle fibers make up what
muslce fascicle
a bunch of muslce fascicles make up what
muscle belly
what CT layer surrounds muscle fiber
endomysium
what CT layer surround muscle fascicle
perimysium
what CT layer surrounds muscle belly
epimysium
what are the 3 types of CT tissue layers
epimysium, perimysium, endomysium
what is the thin vs thick filaments
thin is actin
thick is myosin
what does the h zone only have
thick / myosin
what does the a band have
overlapping actin and myosin
where is an Ap generated, and how does it get to the NMJ
AP is generated in the motor corex of the brain and then moves down the pyramidal tract , then goes to the spinal cord and synapse at the ventral horm of the spine. 85% crosses over to the NMJ
first step of excitation contraction coupling at the Nuromuscular junction
Ach is released at the synapse and binds to Ach receptors at the motor end plate
what happens after ACh binds to receptors at motor end plate
an AP is made and that Ap travels along the T-tubules.
what happens after the AP travels along Tubules
calcium is released into the sarcoplasm of the cell to then bind to troponin