Other Chemical Messengers

Other Chemical Messengers - other physiological processes....

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Other Chemical Messengers Interferons are proteins released when a cell has been attacked by a virus . They cause neighboring cells to produce antiviral proteins. Once activated, these proteins destroy the virus. Prostaglandins are fatty acids that behave in many ways like hormones. They are produced by most cells in the body and act on neighboring cells. Pheromones are chemical signals that travel between organisms rather than between cells within an organism. Pheromones are used to mark territory, signal prospective mates, and communicate. The presence of a human sex attractant/pheromone has not been established conclusively. Biological Cycles Biological cycles ranging from minutes to years occur throughout the animal kingdom. Cycles involve hibernation, mating behavior, body temperature and many
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: other physiological processes. Rhythms or cycles that show cyclic changes on a daily (or even a few hours) basis are known as circadian rhythms . Many hormones, such as ACTH-cortisol, TSH, and GH show circadian rhythms. The menstrual cycle is controlled by a number of hormones secreted in a cyclical fashion. Thyroid secretion is usually higher in winter than in summer. Childbirth is hormonally controlled, and is highest between 2 and 7 AM. Internal cycles of hormone production are controlled by the hypothalamus, specifically the suprachiasmic nucleus (SCN) . According to one model, the SCN is signaled by messages from the light-detecting retina of the eyes.The SCN signals the pineal gland in the brain to signal the hypothalamus, etc....
View Full Document

This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

Ask a homework question - tutors are online