Physiology: Myology

Question 1

Hierarchy of Skeletal Muscle Organization:

Answer 1

Muscle
Fascicle
Muscle Fibre (Muscle Cell)
Myofibril

Question 2

sarcolemma:

Answer 2

the cell (plasma) membrane of the muscle cell

Question 3

Tiny invaginations tunnel in from the sarcolemma towards the centre of the muscle fibre:

Answer 3

T-tubules

Question 4

the cytoplasm of the muscle fibres –contains lots of glycogen:

Answer 4

sarcoplasm

Question 5

specialized contractile organelles of the muscle cell

Answer 5

Myofibrils

Question 6

fluid filled tubes and sacs running along and surrounding each myofibril –they store and release calcium into the cell (when it’s needed):

Answer 6

sarcoplasmic reticulum

Question 7

the functional unit of a myofibril (of contraction)

▪contain 2 contractile proteins: actin and myosin (a.k.a. myofilaments):

Answer 7

sarcomere

Question 8

their overlap also creates a light and dark strips which gives skeletal muscle its striated appearance

Answer 8

myosin and actin