Flashcards in Muscular Tissue Self-Quiz Deck (50):
Somatic motor neuron and all of the muscle fibers it stimulates is a ...
Wasting of muscle is ...
The replacement of skeletal muscle fibers with scar tissue is ...
The synaptic end bulbs of somatic motor neurons contain synaptic vesicles filled with ...
Ability of muscle cells to respond to stimuli by producing electrical impulses:
Sequence of events resulting in muscle contraction:
release of acetylcholine,
muscle action potential,
release of calcium ions from sarcoplasmic reticulum,
calcium ion binding to troponin,
power stroke with actin and myosin binding and release
The brief delay between stimulus and contraction of muscle is ...
Contractile motor protein that binds to actin
Regulatory protein that blocks myosin from binding to actin while muscle is relaxed
Contractile protein containing myosin binding sites
Regulatory protein that hold tropomyosin in place
Protein within sacroplasmic reticulum that binds with calcium
Structural protein that connects Z-disc to M-line; highly elastic and extensible
Structural protein that forms the M-line by binding to titin and holding myosin ends together
Structural protein that forms the Z-disc, binding to ends of titin and ends of actin
Structural protein wrapped around thin filament anchoring them to Z-disc
Structural protein that links sarcomeres to membrane proteins in the sarcolemma
Part of sarcomere that extends the entire length of myosin thick filaments and does not change in length during contraction;
part of thin filaments are found here
The part of sarcomere that does not include any myosin thick filaments, and shortens with muscle contraction
Center part of A band that contains only myosin thick filaments
Midline of sarcomere where myosin ends meet one another
Found between sarcomeres
Decreased tension in the sarcomere occurs when ...
over stretched or too short
Myosin heads cannot contact actin
Maximal tension occurs when what is optimized?
Zone of overlap,
where the myosin and actin filaments maximize their contact
Four sources of ATP for muscle contraction
anaerobic cellular respiration,
aerobic cellular respiration
Is ATP required to bind myosin to actin
OR to release myosin from actin?
ATP hydrolysis is required to reorient myosin heads so they can bind to actin,
and ATP binds to the myosin head to detach is from the actin.
The contraction cycle continues as long as ATP and sufficient calcium ions are available
Outermost connective tissue that surrounds entire muscle
Dense irregular connective tissue separating groups (fascicles) of muscle fibers within a muscle
Areolar connective tissue surrounding individual muscle fibers
Contracting unit of skeletal muscle fiber
Synapse between motor neuron and muscle fiber
Red-coloured oxygen-binding protein found only in muscle fibers
Releases oxygen when needed by mitochondria for ATP production
Stores calcium ions within muscle cells
Plasma membrane of muscle fiber
Cytoplasm of muscle fiber
Has intercalated discs
Skeletal and cardiac
Contraction begin slowly and lasts for long periods
Extended contraction due to prolonged calcium delivery from sarcoplasmic reticulum and interstitial fluid
Autorhythmicity only exhibited in what type of muscle?
Cardiac and visceral smooth
Which muscle type has greatest capacity for regeneration?
Smooth muscle, via pericytes, stem cells found near capillaries and small veins
Regulatory proteins for cardiac muscle tissue
Troponin and tropomyosin, same as for skeletal muscle
Regulator protein for smooth muscle tissue
Sustained contraction of muscle
Fused (complete) tetanus
Larger contractions resulting from stimuli arriving at different times
Concentric, isometric, eccentric
lengthening muscle during contraction
Sustained, but wavering contraction with partial relaxation between stimuli
Unfused (incomplete) tetanus
Continual involuntary activation of skeletal muscle gives ...
Recovery oxygen uptake
Amount of oxygen needed to restore the body's metabolic conditions back to resting levels after exercise