In skeletal muscle, the Ca2+ for contraction
Muscle contraction starts when the muscle fiber depolarizes
due to the release of calcium into the cytoplasm.
Put these events in the correct chronological
1 end plate potentials trigger action potentials
2 transverse tubules convey potentials into the interior of the cell
3 acetylcholine binds to receptors on the motor end plate
4 binding sites on actin are uncovered, allowing myosin to bind and carry out power strokes
5 Ca2+ is released from the sarcoplasmic reticulum
6 chemically regulated ion channels open, causing depolarization
7 Ca2+ ions bind to troponin-C, pulling on tropomyosin
As ATP binds to the myosin head at the beginning
of a muscle contraction cycle...
Regulation of cross-bridge formation is
A contraction that generates force and moves a load is known
as __________, whereas one that generates force without
movement is known as __________.
The components of muscle that allow force
generation without a change in length are the
This question shows a diagram in which a weight hung from a simulation "muscle fiber". Initially the weight is supported below and no movement occurs. The support is then removed. What happens next?
This question shows two simulated muscles, A and B. that form an "opposing group". Muscle B is thicker. When they are both activated...
Why do lengthening (eccentric, pliometric)
contractions more frequently cause injury to skeletal