Muscle unit study guide

The functional unit of a muscle is the:

• sarcomere
• muscle fiber
• sarcolema
• muscle cell

Muscles are held in place and covered by:

• endomysium
• perimysium
• fascia
• sarcomeres

Myofibrils are composed of individual:

• myofilaments
• fasclcles
• sarcolemmas
• sarcomeres

Thin filaments within a muscle fiber are called:

• actin
• myosin
• sarcomeres
• titin

This substance is released into the neuromuscular junction and triggers a muscle contraction:

• acetylcholine
• calcium ions
• sodium ions
• ATP

During a muscle contraction, this molecule must bind to the myosin head in order for the myosin head to release from actin.

• ATP
• calcium
• glucose
• troponin

The I band in a myofibril is an area of:

• thin filaments
• thick filaments
• H zones
• I bands

A sarcomere is defined as the section of myofibril between

• Z lines
• A bands
• M lines
• H zones

Tendons connect

• bone to bone
• muscle to muscle
• muscle to bone
• ligaments to bones

The connective tissue that surrounds individual fibers is:

• perimysium
• endomysium
• epimysium
• exomysium