Answer:
Open channels allow an influx of sodium ions into the cytoplasm of the muscle fiber. The sodium influx also sends a message within the muscle fiber to trigger the release of stored calcium ions. The calcium ions diffuse into the muscle fiber.
Explanation:
Answer:
Deoxyribonucleic acid (DNA)
Explanation:
the biological instructions that make each species unique. DNA, along with the instructions it contains, is passed from adult organisms to their offspring during reproduction
"The process of dissolving bone and returning its minerals to the bloodstream is known as resorption." It is the process by which osteoclasts break bone tissue and release the minerals, causing a transfer of calcium from bone tissue to the blood.
In the cycle of bone growth, resorption is the breakdown and assimilation of old bone. It remove hard bone tissue during the resorption (remodeling) process, and osteoblasts then lay down new bone cells.
Bone loss, or a reduction in bone mass and bone density, is caused by bone resorption. This may be brought on by health issues including hyperparathyroidism, hypovitaminosis D, or even aging-related decreases in hormone synthesis.
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The correct answer is:
D
.Villi in the small intestine have thin-walled capillaries to make the absorption of nutrients more efficient.
Explanation:
The small intestines are well adjusted for absorbing nutrients during digestion by being very long, having villi and microvilli that enlarge surface area, using muscular contractions to move and mix food, and raising and housing digestive enzymes and bile that aid the breakdown of food. The inner surface of the small intestine is not flat but thrown into circular folds, which not only enhance surface area but aid in preparing the ingesta by acting as baffles. Villi: the mucosa makes multitudes of ridges which project into the lumen and are satisfied with epithelial cells.
Answer:
B) Nucleotides
Explanation:
The nucleotides sequence of DNA molecules determines the protein that will be produced. The mRNA molecules carry a copy of DNA to ribosome. the nucleotides consist of three parts- nitrogenous base, pentose sugar and a phospate group. There have more than six billion nucleotide pairs in a cell.