Microscopic Anatomy of Skeletal Muscle

The I band within a skeletal muscle fiber is indicated by ________.

• A

• B

• C

• D

The A band within a myofibril is indicated by ________.

• A

• B

• C

• D

Tags

NGSS.HS-LS1-1

The H zone, located within the A band, lacks thin filaments and is represented by ________.

• A

• B

• C

• D

The myofilament composed of actin is indicated by ________.

• A

• B

• C

• D

What organelle wraps and surrounds the myofibril and stores calcium?

• cross bridge

• sarcoplasmic reticulum

• sarcomere

• sarcolemma

The plasma membrane of a skeletal muscle cell is called the ________.

• sarcoplasm

• sarcoplasmic reticulum

• myofilament

• sarcolemma

What creates the alternating light and dark bands that provides the striation pattern on skeletal muscle tissue?

• Z discs and H zones

• A bands and I bands

• thick filaments and myosin heads

• H zones and M lines

A sarcomere is ________.

• the contractile unit between two Z discs

• a compartment in a myofilament

• the nonfunctional unit of skeletal muscle

• the wavy lines on the cell, as seen in a microscope

Which one of the following is composed mostly of the protein myosin?

• thick filaments

• Z discs

• thin filaments

• light bands

TRUE or FALSE: The sarcoplasmic reticulum wraps like a sleeve around the myofibril and stores and releases calcium.

• True

• False