Unit 4: Notes 2 Flashcards
1
Q
what’s in a muscle?
A
- muscle fibers
- connective tissue
- nerves (motor neurons)
- blood vessels (capillaries)
2
Q
name the connective tissue hierarchy
A
- muscle cell or fiber
- Endomysium
- Perimysium
- Epimysium
3
Q
what is the endomysium?
A
connective tissue around a muscle cell or fiber
4
Q
what is the perimysium?
A
connective tissue around a bundle of muscle fibers
5
Q
how many muscle fibers is a fascicle made up of
A
150
6
Q
what is a bundle of muscle fibers
A
fascicle
7
Q
what is the epimysium
A
connected tissue around a muscle
8
Q
describe the muscle fiber or cell
A
- elongated multinucleated cell/fiber
- lots of mitochondria
- contain hundreds to thousands of myofibrils
- surrounded by sarcolemma
- contains sarcoplasm
9
Q
what are myofibrils?
A
contractile units of muscle fiber
10
Q
what is the sarcolemma
A
The cell membrane
11
Q
what’s is sarcoplasm
A
The cytoplasm of muscle cell
12
Q
what are myofibrils made up of
A
actin and myosin
13
Q
what is actin
A
thin filament
14
Q
what is myosin
A
thick filament
15
Q
what is a sarcomere
A
A single unit of muscle contraction
16
Q
describe a sarcomere
A
- overlapping pattern of actin and myosin
- light (“I” bands)
- dark (“A” bands)
- Z lines
- one Z line to another
