Rating Newest Oldest. Best Answer: Sunny Hostin is a Practical Racist. It is politically incorrect within the black community to suggest that Trayvan Martin was responsible for his own death. He ran home to hide the blunts (and any marijuana) he got someone to buy for him at the 7-11.
The main storage site for calcium is the endoplasmic reticulum in muscle cells, specifically known as the sarcoplasmic reticulum. b. Describe the events that must occur in the muscle cell before calcium is released from this organelle.
A quick review of excitation-contraction coupling in skeletal muscle: The sarcoplasmic concentration of calcium in skeletal muscle is kept very low by the action of Ca-ATPases which remove the calcium and sequester it in the sarcoplasmic reticulum. When an action potential depolarizes the muscle cell membrane, it also travels into the body of the cell via the t-tubules.