C5: Muscular System Flashcards
1
Q
fascicle
A
bundle of muscle cells
2
Q
myofiber
A
muscle cell
3
Q
myofibrils
A
contractile proteins within a myofiber
4
Q
within a myofiber,
what is a t tubule’s function?
A
help get the action potential into the huge cell
5
Q
within a myofiber,
what does the sarcoplasmic reticulum store? release?
A
stores Ca2+, releases Ca2+ in response to an action potential via voltage gated Ca2+ channels
6
Q
- what are the 4 important proteins involved in muscle contraction?
- which are contraction proteins and which are regulatory proteins?
A
- actin (thick filament), myosin (thin filament), troponin, tropomyosin
- contraction proteins: actin and myosin; regulatory proteins: troponin and tropomyosin
7
Q
describe the structure of a sarcomere
A
CHECK FOLDER
8
Q
describe the structure of the sarcomere bands and zones
A
CHECK FOLDER
9
Q
- describe the structure of a sarcomere before muscle contraction
- after muscle contraction
A
CHECK FOLDER
10
Q
describe the contraction cycle
A
CHECK FOLDER
11
Q
____ ions are needed to contract a muscle because it binds to ____ and the ____ binding site becomes exposed so that ____ can bind
A
Ca2+; troponin; myosin; actin
12
Q
describe the 14 steps of skeletal muscle contraction
A
CHECK FOLDER
