Anatomy and Physiology Muscle Unit

Myofibrils are composed of individual:

• sarcomeres

• striations

• myofilaments

• fascicles

Muscles are held in place and covered by:

• endomysium

• fascia

• tendons

• sarcomeres

The functional unit of a muscle is the:

• neuron

• reticulum

• Z line

• sarcomere

Thin filaments within a muscle fiber are called:

• actin

• myosin

• striation

• sarcolemma

This substance will cross the neuromuscular junction to communicate with individual muscle fibers:

• acetylcholine

• sarcolemma

• fascia

• mitochondria

The energy source for muscle contractions is:

• calcium

• glucose

• ATP

• cholinosterase

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The A band in a myofibril is an area of:

• thin filaments

• thick filaments

• transverse tubules

• motor end plates

A sarcomere is defined as the section of fiber between:

• Z lines

• A lines

• H zones

• I Bands

Tendons connect:

• muscles to muscles

• muscles to neurons

• bones to bones

• muscles to bones

The connective tissue that surrounds individual fibers is:

• perimysium

• epimysium

• endomysium

• myomysium