Answer:
The source of Calcium (Ca⁺⁺) for the skeletal muscle cells is the sarcoplasmic reticulum, the main store of intracellular Ca⁺⁺.
Explanation:
Calcium (Ca⁺⁺) is an ion that plays an important role in muscle contraction, a process that requires high cytoplasmic concentrations of this ion to promote myofibrillary activity.
The sarcoplasmic reticulum (SR) -equivalent to the endoplasmic smooth reticulum- is an organelle that regulates the contractile activity of skeletal muscle. The two terminal cisterns of the SR attach to the T-tube, forming a triad, which surrounds the myofibrilla.
Once the muscle cell receives the signal to contract, the Ca⁺⁺ channels are opened and allow Ca⁺⁺ to enter the cell, promoting the exit of this cation from the SR and increased its cytoplasmic levels. This stimulates muscle contraction.
It is polymerase chain reaction hope this helps
This means in order to make one molecule of glucose ________ oxygen atoms are used and twelve oxygen atoms<span> are left over as a waste product. In the chemical equation above it takes six carbon dioxide molecules and 6 water molecules to make one molecule of glucose.
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Answer:
Endoplasmic reticulum and ribosome!
Explanation:
Answer:
the Stratum Corneum
Explanation:
Definition most superficial layer; composed of 25-30 layers of flattened, dead keratinocytes constantly being shed and replaced
