sarcoplasmic reticulum
When muscles are at rest, calcium ions are stored in a cellular structure called the sarcoplasmic reticulum inside each muscle cell. In response to certain signals, the RYR1 channel releases calcium ions from the sarcoplasmic reticulum into the surrounding cell fluid (cytoplasm). The sarcoplasmic reticulum is known for its storage of calcium ions in muscle cells. Calcium is used by almost every cell in your body. While most of the calcium your body has is stored in the bones and teeth, each cell has its own way of storing and releasing the calcium it needs when it needs it. Adults under the age of 50 should be getting 1,000 mg per day of calcium, while those 50 and over need 1,200 mg per day. Smooth ER also is involved in the uptake and release of calcium to mediate some types of cellular activity. In skeletal muscle cells, for example, the release of … calcium from the smooth ER triggers muscle contraction.   Source: http://encarta.msn.com/encyclopedia_761587444/Endoplasmic_Reticulum.html. The sarcoplasmic reticulum stores large amounts of calcium because calcium, when released, aids in muscle contraction. Skeletal muscles release calcium and contract when they receive signals from neurons, or nerve cells, that control muscle movement. The sarcoplasmic reticulum (SR) is where the calcium is stored, released, and recycled within the skeletal muscles. According to Rossi & Dirksen (2006), the balance of the storage, release, and recycling of the required calcium is achieved by the cooperative actions of sarcoplasmic reticulum calcium-regulatory proteins. Describe the role of calcium in muscle contraction, where it is stored, and how it is released and recycled. Calcium storage, release, and recycling. Muscles need to be malleable or have plasticity in order to function correctly. Calsequestrin is stored in the cisternae. Release of calcium—sarcoplasmic reticulum release channels, RyR1 and IP3 receptors (Rossi & Dirksen, 2006). At this step, ions of calcium are released into the sarcoplasm making the muscle contract (Martini & Nath, p. 298). In muscle cells, it's stored in the sarcoplasmic reticulum. In other tissue cells, it's stored in the smooth end
http://ghr.nlm.nih.gov/gene/RYR1 http://www.answers.com/Q/Where_is_calcium_stored_in_the_muscle_cell http://www.livestrong.com/article/450032-calcium-storage-release/ http://www.answers.com/Q/Where_is_calcium_stored_in_the_muscle_cell http://education.seattlepi.com/causes-release-calcium-endoplasmic-reticulum-4091.html http://www.studymode.com/essays/Calcium-Storage-Release-And-Recycling-1074719.html http://www.studymode.com/essays/Calcium-Storage-Release-And-Recycling-1074719.html http://www.studymode.com/essays/Calcium-Storage-Release-And-Recycling-1074719.html http://www.answers.com/Q/Where_is_calcium_stored_in_cells
where in a muscle cell is calcium stored