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There is some calcium outside the cell but the bulk of it comes from intracellular stores.
Wiki User
∙ 15y ago
Wiki User
∙ 13y agoIn skeletal muscles, calcium is sequestered within the endoplasmic reticulum, also called the sarcoplasmic reticulum.
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Each muscle fiber is also called a?
muscle cell
What cellular organelle in muscle fiber corresponds to the endoplasmic reticulum?
Sarcoplasmic reticulum is the cellular organelle in muscle fiber that corresponds to the endoplasmic reticulum.
Does increased muscle density mean more myofibrils per muscle fiber?
Yes, it means that you will gain more myofibrils per muscle fiber. A muscle fiber is a muscle cell, and everybody has about the same number. When you train your muscles, they will develop more myofibrils inside the muscle cells. So you cannot change the number of muscle fibers, or cells, but you can change the number of fibers, or myofibrils, inside them. The end result is more muscle density, not more muscle cells.
DO actin and myosin come from muscle fiber?
Yes
What is it called whan you increase in muscle fiber size?
Hypertrophy
Is calcium a fiber?
No. Calcium does have a major role in muscle fibers when your muscles contract, but it is not the actual fiber.
Which ion no longer influxes into the muscle fiber when acetylcholine is degraded?
calcium
What is the function of cytoplasmic reticulum in the muscle fiber?
increases calcium influx in the muscle fibre, causing contraction.
What would happen to intracellular calcium levels if a muscle fiber were treated with a calcium channel-blocking drug?
It would increse the intracellular calcium
Which substance is stored in the muscle's endoplasmic reticulum and then released when a nerve signal stimulates a muscle fiber?
Calcium ions
What is the most abundant source of energy in a muscle fiber?
fat
Molecules pass in and out of the sarcoplasmic reticulum as a muscle fiber contracts and releases?
calcium Ca2+
The energy source that is directly responsible for muscle fiber contraction is?
ATP
What are the Skeletal muscle cells that function in calcium storage?
in the sarcoplasmic reticulum of a muscle fiber/cell.
In relaxed muscle fiber which structure stores calcium?
It is the Terminal Cisternae- Sac like regions of the sarcoplasmic reticulum that serve as specialized resevoirs of calcium ions
When a muscle contracts it does what?
In order for a muscle to contract, the brain sends a nerve impulse to the muscle it wants to contract. The nerve impulse triggers the potassium inside the muscle fiber cell to switch places with the calcium outside the cell wall, thereby feeding the cell and contracting the muscle. A second nerve impulse from the brain triggers the calcium to switch places with the potassium, releasing the contracted muscle.
What are all muscle cells called?
A single muscle cell is called a muscle fiber.
