Answer:
A) the concentration of calcium ions in the sarcoplasm of a resting muscle
Explanation:
Sarcoplasmic reticulum is a system of the membranous sac that is present around each myofibril and is filled with calcium ions. When muscles are in the resting stage, calcium ions are stored in the sarcoplasmic reticulum.
As the muscle action potential triggers change in voltage-gated calcium ion channels of the sarcoplasmic reticulum, the channels are opened to release the calcium ions in the sarcoplasm. Increased calcium ion levels in sarcoplasm make the muscle fibers to contract.
Removal of acetylcholine from the synaptic cleft ends the production of muscle action potential and calcium ions are moved back from the sarcoplasmic reticulum.
Hence, lower levels of calcium ions are maintained in sarcoplasm when the muscles are in the resting stage.
Answer:
B
Explanation:
During asexual reproduction, the parent essentially clones their DNA to make their child. This means that there is very little possible variation, except for some occasional mutations. However, during sexual reproduction, the child gets the copy of DNA from both of their parents, and their features a mixture of their parents. This makes them not identical to either parent, unlike asexual reproduction. Therefore, the correct answer is choice B. Hope this helps!
- - <span>B) ribosome
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The ribosome contains enzymes that are associated with protein synthesis.
The answer is C. The process of hypothesis and investigation that is used to ask and answer testable questions about observations of the natural world.
Answer:
Ash weight and composition
Cremated remains are mostly dry calcium phosphates with some minor minerals, such as salts of sodium and potassium. Sulfur and most carbon are driven off as oxidized gases during the process, although about 1% -4% of carbon remains as carbonate.
Explanation:
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