Intro to Muscle Physiology

The dense irregular connective tissue layer called the epimysium surrounding the entire muscle is at ____.

• A

• B

• C

• D

• E

The muscle "fiber" or cell is at ____ and is surrounded by a connective tissue layer called _____.

• A; epimysium

• B; perimysium

• C; epimysium

• D; perimysium

• E; endomysium

The lining at A surrounding this muscle "fiber" or cell is termed _____.

• nucleus

• sarcolemma

• endomysium

• myofibril

The name for the cell membrane of a muscle fiber is

• sarcolemma

• sarcoplasm

• sarcomere

• sarcoplasmic reticulum

The name for the cytoplasm of a muscle fiber is

• sarcolemma

• sarcomere

• sarcoplasm

• sarcoplasmic reticulum

The name for the smooth ER of a muscle fiber is

• sarcomere

• sarcoplasm

• sarcoplasmic reticulum

• sarcolemma

The thousands of densely packed, rodlike elements that make up a muscle fiber

• myofibrils

• nuclei

• sarcomeres

• actins and myosins

The striations seen in a muscle fiber are stripes formed from repeating series of dark and light bands along the length of each myofibril. The "dark" bands can be seen at _____.

• A

• B

• C

• D

• E

As discussed in class, a sarcomere is the fundamental unit of muscle contraction, extending from one ______ to another.

• A band

• I band

• M line

• H zone

• Z disc

The thin myofilament that extends across I band and partway in A band

• actin

• myosin