Explanation:
Hormones can travel through the blood and not affect all tissues; only cells possessing<u> receptor</u> sites for that particular hormone are affected, and these cells are called <u>target</u> cells.
The endocrine system involves chemical signalling via the secretion of molecules called hormones into extracellular fluid. They bind to chemical receptors in order to cause specific changes in target cells, these lead to changes in the body's internal environment called homeostasis.
Further Explanation:
During homeostasis the body maintains a constant internal balance in pH, temperature, blood pressure etc. Cells in a multicellular organism become specialized for particular tasks and communicate with one another in order to maintain homeostasis.
Within the human body these are known as hormone cascades, where several complex steps occur- the tissues signal to one another with the use of hormones released by the endocrine system. The regulation (increase and decrease) of these secretions is achieved by negative feedback loops, where the release of certain substances during a cascade in turn halts the secretion of hormones at earlier stages.
The endocrine system includes the thyroid, parathyroid, pituitary, pineal and adrenal glands along with other regions. The bone, adipose tissue, heart, pancreas and liver are a few of the regions of the body which show endocrine function. The brain, or control center functions to receive and process the information from the receptor. Effectors receive the control center's command and illicits a response in the form of a feedback loop, that may oppose or enhance the stimulus.
Learn more about tissue types at brainly.com/question/8487952
Learn more about homeostasis at brainly.com/question/1601808
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Describe the hypothesized sequence of chemical and biological events that preceded the origin of eukaryotic cells. Simple organic molecules joined to form complex molecules due to reactions fueled by energy sources. Eventually, amino acids and then proteins formed in cells. RNA probably existed before DNA.
The pollution from the Industrial Revolution darkening the trees. After the trees darkened from all the soot in the air, the white moths were easier to see and more vulnerable to predators. The dark moths blended into the dark tree bark.
The first question is Bb The second one is bb