what happens when a muscle undergoes isometric contraction
the tension generated is not enough to exceed the resistance of the object to be moved, and the muscle doesn't change its length
located in the walls of hollow internal structures, such as blood vessels, airways, and most organs in the abdominopelvic cavity.
What happens to a myoblasts when it fuses with a bunch of others
List the sequence of structures that action potentials must move through to excite skeletal muscle contraction.
Axon of neuron, sarcolemma, T tubules
At high magnification, the sarcoplasm appears stuffed with little threads. Small structures and the contractile organelles of skeletal muscle
How the calcium that's released triggers the skeletal muscle contraction
From a structure called terminal cisterns of sarcoplasmic reticulum
where are thick and thin filaments stored
Thick: H zone & A band, Thin: I band & A band
The main component of thick filaments and functions as a motor protein in all three types of muscle tissue
A contractile protein that is part of thin filaments in muscle fibers
Regulatory protein that is a component of thin filament; when skeletal muscle fiber is relaxed, covers myosin-binding sites on actin molecules, thereby preventing myosin from binding to actin
regulatory protein that is a component of thin filament; when calcium ions bind to __, it changes shape; this conformational change moves tropomyosin away from myosin- binding sites on actin molecules, and muscle contraction subsequently begins as myosin binds to actin