Lab 20: Skeletal Muscle Structure and Function

Question 1

Membranous channel extending inward from muscle fiber membrane

Answer 1

Transverse tubule

Question 2

Cytoplasm of a muscle fiber

Answer 2

sarcoplasm

Question 3

Connective tissue located between adjacent muscles

Answer 3

Fascia

Question 4

Layer of connective tissue that separates a muscle into small bundles called fascicles

Answer 4

Perimysium

Question 5

Plasma membrane of a muscle fiber

Answer 5

Sarcolemma

Question 6

Layer of connective tissue that surrounds a skeletal muscle

Answer 6

Epimysium

Question 7

Unit of alternating light and dark striations between Z discs (lines)

Answer 7

Sarcomere

Question 8

Layer of connective tissue that surrounds an individual muscle fiber

Answer 8

Endomysium

Question 9

Cellular organelle in muscle fiber corresponding to the endoplasmic reticulum

Answer 9

Sarcoplasmic Reticulum

Question 10

Cordlike part that attaches a muscle to a bone

Answer 10

Tendon

Question 11

Protein found within thick filament

Answer 11

Myosin

Question 12

A small bundle of muscle fibers within a muscle

Answer 12

Fascicle

Question 13

The ___ of a muscle is usually attached to a fixed location

Answer 13

Origin

Question 14

The ___ of a muscle is usually attached to a movable location.

Answer 14

Intersection

Question 15

A muscle responsible for most of a movement s called a(n)

Answer 15

Against prime moveer

Question 16

Assisting muscles are called ___.

Answer 16

Synergists

Question 17

Antagonists are muscles that resist the actions of ___ and cause movement in the opposite direction.

Answer 17

Prime movers

Question 18

When the forearm is extended at the elbow joint, the ___ muscle acts as the prime mover.

Answer 18

Triceps Brachii

Question 19

When the biceps brachii acts as the prime mover, the ___ muscle assists as a synergist.

Answer 19

Triceps Brachii

Question 20

A ____ is a synergistic muscle that will stabilize a joint when another contracting muscle exerts a force on something else.

Answer 20

Fixator