The Sarcoplasmic Reticulum stores calcium and releases it through the terminal cisternae into the tubule.
Short answer:Yes, bones must have calcium.Longer Answer:Bones are made up of a naturally occurring mineral called Hydroxylapatite, which has the chemical formula Ca5(PO4)3(OH). Therefore all bone has calcium (symbol: Ca). How much additional calcium is the important part to look at when looking for strong bones and enough calcium stores for other functions such as calcium's role in muscle contractions.
The organelle that stores calcium in resting muscle cells is the sarcoplasmic reticulum. Calcium ions are released from the sarcoplasmic reticulum during muscle contraction to trigger muscle activity.
sarcoplasmic reticulum
Calcium ions are normally stored in the terminal cisternae of the sarcoplasmic reticulum in muscle cells. When muscle contraction is initiated, these stored calcium ions are released into the cytoplasm, triggering muscle contraction.
The immediate source of calcium ion for muscle fiber is the sarcoplasmic reticulum, a specialized organelle within muscle cells that stores and releases calcium ions in response to nerve signals. When a muscle cell is stimulated, calcium ions are rapidly released from the sarcoplasmic reticulum into the cytoplasm, triggering muscle contraction.
Carbohydrates are stored in muscle as glycogen. Glycogen serves as a readily available energy source during physical activity and is broken down into glucose to fuel muscle contractions. Adequate glycogen stores in the muscles are important for optimal athletic performance.
Smooth ER
fast-twitch fibers
The structure within skeletal muscle cells responsible for calcium storage is the sarcoplasmic reticulum. It stores and releases calcium ions, which are crucial for muscle contraction and relaxation. When a muscle cell receives a signal to contract, calcium is released from the sarcoplasmic reticulum, allowing the muscle to shorten and generate force.
sarcoplasmic reticulum, i think. either that are T tubules
When a muscle cell responds to a stimulus, calcium is released from the sarcoplasmic reticulum. This calcium binds to troponin, triggering a conformational change that allows myosin to bind to actin and initiate muscle contraction.
The concentration of calcium ion is greater in the sarcoplasmic reticulum compared to the sarcoplasm of a resting muscle. This is because the sarcoplasmic reticulum stores and releases calcium ions during muscle contraction.