Chapter 7: Muscular System

Question 1

• set of tissues in the body with the ability to change shape
• produces body movements, maintains posture, and produces body heat

Answer 1

Muscular System

Question 2

Functions of Muscular System

Answer 2

• Movement of the Body
• Maintenance of Posture
• Respiration
• Production of Body Heat
• Communication
• Constriction of Organs and Vessels

Question 3

General Properties of Muscle Tissue

Answer 3

• Contractility
• Excitability
• Extensibility
• Elasticity

Question 4

also called as striated muscle because transverse bands/striations can be seen in the muscle under the microscope

Answer 4

Skeletal Muscle

Question 5

3 Connective Tissue Coverings of Muscle

Answer 5

• Epimysium
• Perimysium
• Endomysium

Question 6

connective tissue sheath that surrounds each skeletal muscle

Answer 6

Epimysium

Question 7

loose connective tissue that separates muscle fascicles from each other

Answer 7

Perimysium

Question 8

loose connective tissue that surrounds each muscle fiber

Answer 8

Endomysium

Question 9

Muscle Fiber Structures

Answer 9

• Sarcolemma
• Transverse tubules, or T tubules
• Sarcoplasmic Reticulum
• Sarcoplasm
• Myofibrils

Question 10

cell membrane of the muscle fiber

Answer 10

Sarcolemma

Question 11

many tubelike inward folds in the sarcolemma, located along the surface of the muscle fiber

Answer 11

Transverse tubules or T tubules

Question 12

an enlarged portion of the smooth ER that is associated in T tubules

Answer 12

Sarcoplasmic Reticulum

Question 13

cytoplasm of a muscle fiber

Answer 13

Sarcoplasm

Question 14

bundles of protein filaments in the sarcoplasm

Answer 14

Myofibrils

Question 15

basic structural and functional unit of the skeletal muscle and the smallest portion of a skeletal muscle capable of contracting

Answer 15

Sarcomeres

Question 16

separates one sarcomere from the next and a network of protein fibers that forms a stationary anchor for actin myofilaments to attach

Answer 16

Z-disks

Question 17

• dark
• consists of an overlap between actin and myosin myofilaments
• extends length of myosin myofilaments
• stays same size during contraction

Answer 17

A-band

Question 18

• Light
• consists of actin myofilaments only
• decrease in size during contraction
• spans each Z disk and ends at myosin myofilaments

Answer 18

I-band

Question 19

• smaller, lighter staining regioon in the center of each A band
• contains only myosin myofilaments

Answer 19

H-zone

Question 20

consists of fine protein filaments that anchor the myosin myofilaments in place

Answer 20

M-line

Question 21

• thin filaments
• consists of actin, troponin, and tropomyosin

Answer 21

Actin

Question 22

binding sites for calcium ions

Answer 22

Troponin

Question 23

block myosin myofilament binding sites on actin myofilament in an unstimulated muscle

Answer 23

Tropomyosin

Question 24

thick filaments and resembles bundles of tiny golf clubs

Answer 24

Myosin

Question 25

highly specialized, electrically excitable cells that are polarized which creates an electrical charge difference across the cell membrane

Answer 25

Muscle Fibers