BIOM 3200 Final: Unit 01 Questions

• School: University of Guelph
• Department: Biomedical Sciences
• Course: BIOM 3200
• Professor: Nicole Campbell

Document Summary

1. 01 define endocrine, autocrine and paracrine, target cell, hormone. Hormone: chemical messengers secreted from endocrine gland/tissue that exert physiological effect on target cell. Target cell: cell that bears receptors for a hormone. Endocrine hormone: hormone secreted into bloodstream and transported to target cells. Autocrine: hormone secreted into extracellular fluid and acts upon cell produced it. Paracrine: hormone secreted into extracellular fluid and act on cells near secretion site but not on cell that produced it. 1. 02 describe and give examples of negative and positive feedback loops. Endocrine gland has a tendency to over secrete its hormone, thus, hormone has a more intense effect on target organ. Target organ is stimulated to perform the function stronger, but if too much function occurs (reaches a cap), some factor associated with the function feeds back on the control gland to reduce hormone secretion. If target organ responds poorly, hormone secretion continues -> disease.