Muscle Structure

Tendon

Name part A,

This is strong connective tissue that attaches muscle to bone

Fascicle

Name part B,

This is a bundle of muscle fibres

Perimysium

Name Part C,

This is fibrous connective tissue that surrounds groups of muscle fibers called fascicles

Blood vessels

Name part D

This supplies nutrients and removes wastes

Muscle fibre

Name part E,

This is a single muscle cell that is multinucleate is strated muscle

Myofibril

Name part F,

This is one of many contractile filaments that make up a striated muscle fibre

Sarcomere

Name part G

This is the basic contractile unit of striated muscle; the segment of a myofibril

Titin

Name H

This is an elastic protein, keeps thick and thin filaments aligned

Myosin filament

Name part I,

This is a thick filament that attaches to actin filament.

Actin

Name part J,

This is a protein that mainly makes up the thin filaments in striations in skeletal muscle cells

Myosin

Name part K

Actin

Name part L

Muscle fibre

Name part A,

This is an individual unit of muscle tissue, individual cells that contract when stimulated

Sarcoplasmic reticulum

Name part B,

This is smooth endoplasmic reticulum in the muscle fiber that stores calcium

Z line

Name the parts labelled C,

This is the boundary of a sarcomere, point of anchor for thin actin filaments

Sarcomere

Name the section labelled D,

This is the functional unit of muscle that produces muscular contraction

Myosin filament

Name part E

Thick filament that attaches to actin filament

Actin filaments

Name part F

A band

Name the section labelled G,

This is the dark thick band containing mainly thick filaments with some overlap of thin filaments

I band

Name the section labelled I,

This is the region of the sarcomere made up only of thin filaments. The I band is bisected by a Z line. I bands get shorter during muscle contraction.