Structure of Skeletel Muscle

Question 1

Describe the structure of the skeletel muscle

Answer 1

skeletel muscle

muscle fibre

myofibrils

Question 2

Muscle cells join up to make what?

Answer 2

muscle fibres

Question 3

What do long muscle fibres share?

Answer 3

cytoplasm (sarcoplasm)

cell surface membrane (sarcolemma)

Question 4

what do muscle fibres have?

Answer 4

many nuclei

Question 5

Why do muscle fibres have a lot of mitochondria?

Answer 5

to release energy for contraction in respiration

Question 6

What is each fibre made up of?

Answer 6

myofibrils

Question 7

What are myofibrils made up of?

Answer 7

proteins called myofilaments

Question 8

What do myofribrils look like?

Answer 8

striations

Question 9

What is the striated pattern on the myofribrils called?

Answer 9

sarcomeres

Question 10

How does the sarcomere span?

Answer 10

from one z-line to another

Question 11

name the different coloured striations?

Answer 11

z line

i band

a band

h zone

Question 12

what happens to which striations when the muscle contracts?

Answer 12

I and H band get shorter

Question 13

Name the 2 types of protein myofilaments

Answer 13

actin = thin

myosin = thick

They slide over each-other to shorten the muscle

Question 14

define sarcoplasm

Answer 14

cytoplasm of muscle cell

Question 15

define sarcolemma

Answer 15

cell membrane of muscle cell

Question 16

define sarcoplasmic reticulum

Answer 16

specialised ER which stores calcium plus ions

Question 17

what is sarcoplasmic reticulum made up of?

Answer 17

T-tubules