Zones of Contraction
This zone of the sarcomere contains overlapping thin and thick filaments and shortens during muscle contraction.
A-band
This is the name of the process where myosin heads bind to actin, generating force and movement in muscle contraction.
cross-bridge cycle
Myosin binds to this protein
Actin
This property allows muscles to return to their resting length after contraction.
Elasticity
What neurotransmitter is released at the synapse
acetylcholine
This line bisects the H-zone and serves as an anchor for thin filaments during muscle contraction.
M-line
During the cross-bridge cycle, this molecule binds to myosin heads, providing the energy needed for muscle contraction.
ATP
This neurotransmitter leads to muscle depolarization and is released in the synaptic cleft
Acetylcholine
This type of muscle contraction occurs when muscle lengthens while generating force.
Eccentric Contraction
What ions bind to vesicles and release release acetylcholine
Calcium Ions
This zone of the sarcomere represents the region where thin filaments do not overlap with thick filaments and only contains thick filaments.
H-zone
The power stroke occurs during this phase of the cross-bridge cycle, where myosin pulls actin filaments towards the center of the sarcomere.
the release of inorganic phosphate (Pi) from ATP
Calcium ions bind to this protein complex, causing a conformational change that moves tropomyosin away from actin's active sites.
This phenomenon occurs when muscle tension remains constant as muscle length changes.
Isotonic Contraction
The process of an action potential triggering a muscle contraction
Excitation contraction coupling
The areas that get closer to each other during contraction
Z-Line
This regulatory protein covers the active sites on actin during muscle relaxation, preventing myosin binding.
tropomyosin
The sarcoplasmic reticulum releases this ion into the cytoplasm to initiate muscle contraction
calcium
This component of the sarcomere moves during muscle contraction, shortening the sarcomere.
actin filaments
The relationship between a muscles length, and the amount of force that it can generate.
length-tension relationship
During muscle contraction, this zone of the sarcomere decreases in length as thin filaments slide past thick filaments.
I-band
This enzyme hydrolyzes ATP to ADP and Pi, providing energy for muscle contraction.
ATPase
This protein spans from the Z Disc to the M Line and provides structural support and elasticity to muscles
Titin
The _____ states that smaller motor units are recruited first during this process.
Size Principle
This process refers to the activation of additional motor units within a muscle to generate more force.
Muscle fiber recruitment