Skeletal Muscle Flashcards
1
Q
Contractile elements
A
Actin Myosin Banding Z-lines (between Disks) M-lines (middle) H-lines (helles)
2
Q
Sarcoplasmic Reticulum
A
Modified ER
Calcium Ion storage
(Depolarization triggers release)
3
Q
Fiber Type-I
A
Slow twitch
Fatigue resistant
4
Q
Fiber Type-II
A
Fast twitch
Fatiguable
5
Q
Motor Units
A
Neurons
6
Q
Muscle Stimulation
A
Nerve impulses release acytlcholme into muscle cell
Opening of gates causes depolarization
Depolarization causes Sarcoplasmic Reticulum Ion channel to open
7
Q
Muscle Contraction
A
Calcium binds to tropinin
Myosin binds to actin and tilts creating the power stroke
Myosin disassociates and head returns to normal position
8
Q
Origin (attachment)
A
Fixed
9
Q
Insertion (attachment)
A
Mobile
10
Q
Belly (attachment)
A
Thickened middle portion
11
Q
Synergistic
A
Groups that work together
12
Q
Antagonistic
A
Groups with opposing actions
I.e. opposite sides of limbs
