muscles Flashcards
1
Q
name the 3 types of muscles
A
- smooth
- myocardial
- skeletal
2
Q
what is a myofibril
A
a contractile organelle
3
Q
structure of a myofibril contains
A
- lots of mitochondria
- multiple nuclei
- within a muscle cell
4
Q
I Band
A
actin
5
Q
A Band (And)
A
actin and myosin
6
Q
H Zone
A
just myosin
7
Q
actin
A
thinner
2 strands twisted
8
Q
myosin
A
thicker
long rod-shaped tails with bulbous heads
9
Q
describe the sarcomere structure
A
- made of actin and myosin fibres with actin surrounding myosin
- the I bands only contain actin filaments
- the A bands contain actin AND myosin filaments
- the H - zone only contains myosin
- the Z Discs represent the start and end of one sarcomere
10
Q
explain how muscle contraction affects each part of the sarcomere
A
- overall the sarcomere shortens
- the Z discs are pulled closer together
- so the
