Hormone Glands and Target Cells Listed Mostly Accurate

Hormones are molecules that are produced by endocrine glands, including the hypothalamus, pituitary gland, adrenal glands, gonads, (i.e., testes and ovaries), thyroid gland, parathyroid glands, and pancreas (see figure 1). The term “endocrine” implies that in response to specific stimuli, the products of those glands are released into the bloodstream.1 The hormones then are carried via the blood to their target cells.

A slope different from one means diminishing or increasing returns with endocrine cell number—for example, large endocrine glands might conceivably have decreased vascularization and thus each cell could serve fewer target cells than smaller glands. We considered a comprehensive set of 64 human hormones.1,20 For each hormone, we used the literature to estimate the number of cells that secrete it.

The number of cells that secrete a hormone is approximately proportional to the total number of its target cells Secreting versus target cell numbers for 24 hormones secreted by dedicated cell types. Regression line and 95% CI are shown in blue, ... 0001. The slope of the log-log regression line is 0.95 with a 95% confidence interval of (0.82,1.05), which suggests isometric scaling. The ratio of target to secreting cell numbers averages ... 0.56. This roughly corresponds to 2,000 target cells served by each dedicated endocrine cell.

The major endocrine glands are the pituitary, pineal, thymus, thyroid, adrenal glands, and pancreas. In addition, men produce hormones in their testes and women produce them in their ovaries.

It's called the master gland because it regulates the activity of the glands. The hypothalamus sends either hormonal or electrical messages to the pituitary gland. In turn, it releases hormones that carry signals to other glands.

Some target tissues become less sensitive to their controlling hormone. The amount of hormones produced may also change. Blood levels of some hormones increase, some decrease, and some are unchanged. Hormones are also broken down (metabolized) more slowly. Many of the organs that produce hormones are controlled by other hormones. Aging also changes this process. For example, an endocrine tissue may produce less of its hormone than it did at a younger age, or it may produce the same amount at a slower rate.

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Note that I often suggest differing usages as appropriate depending on the setting: spoken vs. written, informal vs. formal; slang is often highly appropriate. In fact, most of the errors discussed on this site are common in the writing of privileged middle-class Americans, and some are characteristic of people with advanced degrees and considerable intellectual attainments.

Other pairs commonly confused: “lead”/”led” and “accept”/”except.” · Check a glossary of usage to find the right choice. ... The recession had a negative affect on sales. ... The recession had a negative effect on sales. (or) The recession affected sales negatively. ... The laboratory instructor chose not to offer detailed advise. ... The laboratory instructor chose not to offer detailed advice. Spelling errors are usually perceived as a reflection of the writer’s careless attitude toward the whole project.