Skeletal Muscle

Question 1

Muscle fibres an elongated multi_____ cell. it has a ____ banded appearance. each contain a large number of rod like ____

Answer 1

Muscle fibres an elongated multi-NUCLEATE cell. it has a BANDED banded appearance. each contain a large number of rod like MYOFIBRILS

Question 2

myofibrils are contractile elements composed of bundles of ____

Answer 2

myofilaments

Question 3

The Three types of Skeletal muscle fibres and there uses + fuel source

Answer 3

Type 1 - Slow Twitch
Used for Long Distance as it has high amounts of Myoglobin + Mitochondrial contents
Oxidative fuel source

Type 2A Fast twitch and is oxidative so used for 400m - 800m
Oxidative fuel source

Type 2X - Fast Twitch
Large fibres and white
Uses a Glycolytic fuel source

Question 4

Where are T Tubules found and their use?

Answer 4

Found Wrapped around myofibrils under the membrane

Rich in Ion channels and release ions into the Sarcoplasmic Reticulum (SR)

Question 5

Where’s the Sarcoplasmic Reticulum found and what’s it filled with?

Answer 5

A Channel along the length of the fibril filled with Calcium (Ca++)

Question 6

When it recieves a signal from the T-Tubules what happens?

Answer 6

When it recieves the signal from the T Tubules it releases the Calcium

This signals the contraction of the sarcomere

Question 7

What is contained with the two Z discs of a Saromere?

Answer 7

Composed of myofilaments made up of contractile protiens

Thick and thin filaments giving striated appearance

Question 8

Another way to say Thin and Thick Filaments

Answer 8

Actin and Myosin

Question 9

The Thick Filament is a bundle of