Answer:
by the sarcoplasmic reticulum's calcium ion pumps
Explanation:
Rigor mortis or postmortem rigidity, is a state caused by chemical changes in the muscles that occur post mortem and cause the limbs of the corpse to stiffen.
This occurs because after death, there is no cellular respiration and consequently, no oxygen nor ATP (ATP is required for the muscle relaxation).
Calcium enters the cytosol after death because it is released due to the deterioration of the sarcoplasmic reticulum and due to the breakdown of the sarcolemma. Ca2+ ions activate the formation of actin-myosin cross-bridging necessary for the contraction. Muscles are unable to relax, because myosin heads continue to bind with the active sites of actin and there is no ATP to destabilize the myosin-actin bond.
Answer:
c. The size of the cell increases during the G2
Explanation:
Interphase of cell cycle includes G1, S and G2 phases. The G2 phase is the second interval or gap that comes after DNA replication in the S phase. During the G2 phase, the cell prepares for division. The cells in the G2 phase exhibit an increased rate of protein synthesis to finally prepare them for cell division. However, there is no increase in cell size during this phase. G1 phase is the first interval of cell growth and activity before the start of DNA replication in the S phase. During the G1 phase, cells experience growth and normal metabolism.
A Tsunami
Tsunamis are very long waves that can reach up to very big heights
The biggest tsunami ever was 1720 feet tall
Answer:
Luminosity is an intrinsic(natural) measurable property of a star independent of distance. The concept of magnitude, on the other hand, incorporates distance. The apparent magnitude is a measure of the diminishing(decrease) flux of light as a result of distance according to the inverse-square law.
