Muscle Flashcards
Ability of muscle tissue to generate force/tension (with or without shortening); requires ATP
Contractility
Ability of muscle tissue to stretch
Extensibility
Striated, multinucleated muscle cells
Skeletal
Striated, uninucleated muscle cells joined by intercalated discs
Cardiac
Nonstriated, uninucleated muscle cells
Smooth
Dark red skeletal muscle fibers with lots of mitochondria and myoglobin
Type 1- Slow, Red Oxidative Fibers
Skeletal muscle fibers with lots of myoglobin, glycogen, and mitochondria; for rapid contractions and short burst of activity
Type IIa- Fast, Intermediate Oxidative-Glycolytic Fibers
Pale skeletal muscle fibers with lots of glycogen and fewer mitochondria and myoglobin; for rapid contractions, but fatigue quickly
Type IIb- Fast, White Glycolytic Fibers
Bundle of contractile and regulatory proteins arranged in regular manner
Myofibril
Functional unit of muscle, smallest unit of contraction
Sarcomere
Actin myofilament
Thin Filament
Myosin myofilament
Thick Filament
Titin myofilament
Elastic filament
Segments of myosin that bind to actin and pull Z discs in
Globular Heads
As the myofibril length decreases, the muscle cell length ______
Decreases
Blocks myosin binding site of G-actin
Tropomyosin
Chain of G-actins
F-actin (Fibrous actin)
Subunit, binding site for Myosin
G-actin
Binds troponin to tropomyosin
TnT (a subunit of Troponin complex)
Site on thin filament where calcium binds
TnC (subunit of Troponin Complex)
Myosin globular heads are a binding site for:
- ATP
- Actin
- ATPase
Takes up, stores, and releases Calcium ions
Sarcoplasmic Reticulum
Transverse extensions of plasma membrane into cell
T Tubules
Chemical synapse between motor (efferent) neuron and skeletal muscle fiber (cell)
Neuromuscular Junction
