Answer: Humans—and other complex multicellular organisms—have systems of organs that work together, carrying out processes that keep us alive.
The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems.
The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food.
The survival of the organism depends on the integrated activity of all the organ systems, often coordinated by the endocrine and nervous systems.
A stem cell is an extraordinary, early stage, unspecified cell that has the potential to develop into a number of specialized cell types.
there important because they can replace cells that have been lost or damaged
Answer:
having a genetically diverse population make a species more likely to survive a change to the enviroment because random mutations can occur in a species and if a sudden change in the environment were to occur like extreme heat for example, some of the mutations in their DNA may help them survive this extreme heat and the species will be more likely to survive
Low-density lipoproteins (LDLs) can contribute to the build-up of plaque that narrows blood vessels; however, LDLs are necessary because they are used to synthesize eicosanoid
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The article eicosanoid is practiced to include those biologically effective lipid intercessors obtained essentially from C20 fatty acids. The 'actual' eicosanoids are provided enzymatically with high stereochemical accuracy, and this is necessary for their biological purposes.
Biosynthesis of eicosanoids concerns the progress of multiple enzymes. Eicosanoids are produced largely from unesterified fatty acids, no the CoA esters, and they work in this kind, but it is frequently noticed that they may transpire and some may admittedly be incorporated while esterified to other lipids.
The anterior pituitary gland produces growth hormone (GH), prolactin (PRL), follicle-stimulating hormone (FSH), luteinizing hormone (LH), adrenocorticotropic hormone (ACTH), and thyroid-stimulating hormone (TSH).
The posterior pituitary gland stores anti-diuretic hormone and oxytocin, both of which are actually produced in the hypothalamus.