Characteristics of Muscle
This process consists of muscle cells being stimulated by chemical signals, stretching, and other stimuli.
What is excitability?
This is described as being a bundle of muscle fibers in a muscle that is supplied by nerves and blood vessels.
What is a fascicle?
This is the point where a nerve fiber meets a muscle fiber.
What is the neuromuscular junction?
This is the process where action potentials in the motor nerve fiber lead to action potentials in the muscle fiber.
What is excitation?
This is the brief delay between when a muscle is stimulated and when it begins to respond.
What is the latent period?
During this process, a local electrical excitation sets off a wave of excitation that quickly travels along the cell and begins contraction.
What is conductivity?
This part of a muscle cell is slender, elongated, threadlike, and is enclosed in a plasma membrane.
This happens when there is an influx of Na+ ions going into the cell causing the cell membrane's potential to be less negative.
What is depolarization?
This is when action potentials in the muscle fiber trigger the release of calcium ions, which bind to troponin and prepares myofilaments to contract.
What is excitation-contraction coupling?
These fibers rapidly contract and rely on anaerobic ATP production, which causes them to fatigue quickly.
What are fast-twitch fibers?
What property allows muscle cells to pull on bones and other organs to create movement?
What is contractility?
This is a bundle of protein myofilaments in a muscle fiber.
What is a myofibril?
This happens when Na+ channels close and K+ channels open, causing K+ to move out of the cell allowing the cell membrane to become negative again.
What is repolarization?
This represents the cycle of repeating events that cause thin filaments to slide over a thick filament, causing tension in a muscle.
What is the sliding filament theory?
This is a contraction where there is a change in length but no change in tension.
What is an isotonic contraction?