muscles

Question 1

name the 3 types of muscles

Answer 1

• smooth
• myocardial
• skeletal

Question 2

what is a myofibril

Answer 2

a contractile organelle

Question 3

structure of a myofibril contains

Answer 3

• lots of mitochondria
• multiple nuclei
• within a muscle cell

Question 4

I Band

Answer 4

actin

Question 5

A Band (And)

Answer 5

actin and myosin

Question 6

H Zone

Answer 6

just myosin

Question 7

actin

Answer 7

thinner

2 strands twisted

Question 8

myosin

Answer 8

thicker

long rod-shaped tails with bulbous heads

Question 9

describe the sarcomere structure

Answer 9

• 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

Question 10

explain how muscle contraction affects each part of the sarcomere

Answer 10

• overall the sarcomere shortens
• the Z discs are pulled closer together
• so the