Digestion obtains the nutrients used in cellular respiration, such as glucose.
<h2>Droughts kills many trees</h2>
Explanation:
- The example of Droughts kills many trees do not involve the flow of information providing feedback.
- Drought is a condition when there is a prolonged shortage of water.
- The duration of drought can be for a month, year or more than a year.
- The drought is caused due to the human activities such as Deforestation.
- Due to less rainfall in a region also causes the Drought in an area.
C.
1)<span>Pigs digestive tracts and nutritional needs are very similar to humans.
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2)<span>Pigs also have hearts that are similar in size and makeup to the human
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heart. Pig heart valves are used to replace defective human heart valves.
3)</span><span>Answer "Pig" DNA is most similar to Human DNA..
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In the case of the muscular cramps, the muscle contraction starts with the generation of the action potentials from the brain. The action potential causes the release of the calcium ions movement out of the sarcoplasmic reticulum (storage site of calcium). The calcium released in this process causes the contraction of the myofibrils with the help of the ATP molecules. Meanwhile, the calcium is pumped back to the sarcoplasmic reticulum through the fast calcium pumps.
The contraction of one muscle cell generate the action potential in neighboring muscle cells. When the generation of the action potential is stopped, the sarcoplasmic reticulum relaxes as well as the muscle is relaxed. The fast calcium pump is powered by a sodium gradient, and the calcium influx is a result of fast outflux of the sodium ions from the sarcoplasmic reticulum.
In case, the sodium ion is less, the calcium pumps cannot be powered, the calcium ion would remain in myofibril, as a result, the muscle would be contracted for a longer time and this result in cramps. The muscle in this case, would be relaxed by the ATP instead of sodium gradient. So, it can be concluded that the muscle cramps are caused when the muscles are not able to relax properly.
Biologists use plasmids to join two DNA molecules together.
