Muscle

Question 1

Ability of muscle tissue to generate force/tension (with or without shortening); requires ATP

Answer 1

Contractility

Question 2

Ability of muscle tissue to stretch

Answer 2

Extensibility

Question 3

Striated, multinucleated muscle cells

Answer 3

Skeletal

Question 4

Striated, uninucleated muscle cells joined by intercalated discs

Answer 4

Cardiac

Question 5

Nonstriated, uninucleated muscle cells

Answer 5

Smooth

Question 6

Dark red skeletal muscle fibers with lots of mitochondria and myoglobin

Answer 6

Type 1- Slow, Red Oxidative Fibers

Question 7

Skeletal muscle fibers with lots of myoglobin, glycogen, and mitochondria; for rapid contractions and short burst of activity

Answer 7

Type IIa- Fast, Intermediate Oxidative-Glycolytic Fibers

Question 8

Pale skeletal muscle fibers with lots of glycogen and fewer mitochondria and myoglobin; for rapid contractions, but fatigue quickly

Answer 8

Type IIb- Fast, White Glycolytic Fibers

Question 9

Bundle of contractile and regulatory proteins arranged in regular manner

Answer 9

Myofibril

Question 10

Functional unit of muscle, smallest unit of contraction

Answer 10

Sarcomere

Question 11

Actin myofilament

Answer 11

Thin Filament

Question 12

Myosin myofilament

Answer 12

Thick Filament

Question 13

Titin myofilament

Answer 13

Elastic filament

Question 14

Segments of myosin that bind to actin and pull Z discs in

Answer 14

Globular Heads

Question 15

As the myofibril length decreases, the muscle cell length ______

Answer 15

Decreases

Question 16

Blocks myosin binding site of G-actin

Answer 16

Tropomyosin

Question 17

Chain of G-actins

Answer 17

F-actin (Fibrous actin)

Question 18

Subunit, binding site for Myosin

Answer 18

G-actin

Question 19

Binds troponin to tropomyosin

Answer 19

TnT (a subunit of Troponin complex)

Question 20

Site on thin filament where calcium binds

Answer 20

TnC (subunit of Troponin Complex)

Question 21

Myosin globular heads are a binding site for:

Answer 21

• ATP
• Actin
• ATPase

Question 22

Takes up, stores, and releases Calcium ions

Answer 22

Sarcoplasmic Reticulum

Question 23

Transverse extensions of plasma membrane into cell

Answer 23

T Tubules

Question 24

Chemical synapse between motor (efferent) neuron and skeletal muscle fiber (cell)

Answer 24

Neuromuscular Junction

Question 25

Motor (efferent) neuron and all the muscle fibers (cells) it innervates

Answer 25

Motor Unit

Question 26

Anchoring junction that links actin (thin) filaments

Answer 26

Fascia Adherens

Question 27

Anchoring junctions that links intermediate filaments

Answer 27

Desmosomes

Question 28

Communicating junctions for intracellular communication

Answer 28

Gap Junction