Joints and skeletal muscles - structure and contraction

Which element of skeletal muscle is correctly labelled?

• 1 - muscle fibre

• 6 - perimysium

• 3 - sarcolemma

• 2 - endomysium

Fasciculus (bundle of muscle fibres) is labeled with:

• 1

• 4

• 5

• 6

Endomysium is labelled with

• 9

• 4

• 8

• 6

Role of element 8 is

• to supply fibres with oxygen and nutrients

• to pass the nerve impulse

• to strenghten simultaneous contraction

• to remove waste products

In flexion at the elbow, what is prime mover?

• ulna

• humerus

• biceps

• triceps

Muscles are attached to bones by:

• cartilages

• tendons

• ligaments

• myofibrils

Which elements are labelled correctly?

• 2 - sarcolemma

• 3 - sarcoplasmic reticulum

• 4 - sarcoplasm

• 5 - myofibril

• 1 - nucleus

T-tubule is labeled with:

• 1

• 5

• 9

• 10

Structure labeled with 9:

• is sarcoplasmic reticulum

• stores actin for muscle needs

• releases Ca²⁺ when depolarised

• produces ATP

Element labeled with 8

• is a muscle fibre

• consists only of actin

• requires ATP and Ca²⁺

• depolarizes when nerve impulse reaches the cell