📌 Homeostasis - Free Essay, Term Paper Example | girl-with-a-pearl-earring.info
Internally fertilized eggs are deposited in gelatinous mass. The large, yolky egg of terrestrial snails are deposited in moist environments, such as leaf litter, and a calcareous shell may encapsulate them. In marine gastropods, spiral cleavage results in free swimming trochophore larva that develops into another free swimming larva with foot, eyes, tentacles, and shell called a veliger larva. Sometimes, the trocophore is suppressed, and the veliger is primary larva. Torsion occurs during the veliger stage, followed by settling and metamorphosis to the. An example of a detritivore is a worm.
After being made by the beta cells in the pancreas, insulin travels down to the body 's tissue cells to be taken up by the body 's cell. Insulin also stimulates glycogen formation in the liver. In the liver, glucose is converted to glycogen which can then be stored in the body for later uses. The glucose is then released into the circulation for use by body cells. It stimulates the liver to take up amino acids from the blood and convert them into glucose.
The human body is an incredibly complex machine, consisting of numerous organ systems that interact continuously with both the internal and external environment. The internal environment is that inside the body itself and is dynamic, i. These limits are defined by set points in the various body systems, such as core temperature, which is set at around 37oC in thermoregulatory centres of the hypothalamus Cabanac Biological health occurs when the body systems are functioning adequately to keep these parameters in their normal range. Disease occurs when one or more of these extends outside the range.