Chapter 7 Terms - Muscular System

Question 1

Moves the body by pulling on bones of skeleton. A bundle of skeletal muscle fibers wrapped in connective tissue layers.

Answer 1

Skeletal muscle

Question 2

Found only in the heart. Propels blood.

Answer 2

Cardiac muscle

Question 3

Moves fluid and solids along digestive tract. Regulates diameter of small arteries.

Answer 3

Smooth muscle

Question 4

Cell membrane

Answer 4

Sarcolemma

Question 5

Cytoplasm

Answer 5

Sarcoplasm

Question 6

Endoplasmic reticulum (ER)

Answer 6

Sarcoplasmic reticulum

Question 7

A network of narrow tubules. Form passageways through the muscle fiber.

Answer 7

T tubules

Question 8

Inside each muscle fiber, branches of T tubules encircle cylinder-shaped structures. Bundles of myofilaments.

Answer 8

Myofibril

Question 9

The myofilaments that make up myofibrils are organized into repeating functional units. The smallest functional unit of the muscle fiber.

Answer 9

Sarcomere

Question 10

Darker band; contains thick and thin filaments.

Answer 10

A band

Question 11

Lighter band; contains only thin filaments.

Answer 11

I band

Question 12

Boundary between adjacent sarcomeres.

Answer 12

Z disc (Z line)

Question 13

Lighter band; contains only thick filaments.

Answer 13

H zone

Question 14

Connects central part of each thick filament.

Answer 14

M line

Question 15

Composed primarily of myosin.

Answer 15

Thick filament

Question 16

Composed mostly of actin.

Answer 16

Thin filament

Question 17

Makes up most of the thin filament as a twisted double strand. Contains binding sites for myosin.

Answer 17

Actin

Question 18

Binds to tropomyosin and actin keeping complex in place. Also has binding site for calcium.

Answer 18

Troponin

Question 19

Covers myosin binding sites on actin when muscle relaxed.

Answer 19

Tropomyosin

Question 20

Muscle cell

Answer 20

Muscle fiber

Question 21

A bundle of muscle fibers

Answer 21

Fascicle

Question 22

Delicate connective tissue surrounding individual muscle fibers

Answer 22

Endomysium

Question 23

Fibrous layer dividing skeletal muscle into bundles of fibers called muscle fascicles

Answer 23

Perimysium

Question 24

Dense layer of collagen fibers surrounding entire muscle

Answer 24

Epimysium

Question 25

Bundle of fibers. Attaches muscle to bone.

Answer 25

Tendon

Question 26

Sheet of fibers. Attaches muscle to broader area.

Answer 26

Aponeurosis

Question 27

Protein filaments made primarily of the proteins actin and myosin.

Answer 27

Myofilaments