Search results
Results from the WOW.Com Content Network
Positive feedback (exacerbating feedback, self-reinforcing feedback) is a process that occurs in a feedback loop which exacerbates the effects of a small disturbance. That is, the effects of a perturbation on a system include an increase in the magnitude of the perturbation. [ 1 ]
A peacock displays his long, colored tail, an example of secondary sex characteristics. An adult human's Adam's apple, a visible secondary sex characteristic common in males. A secondary sex characteristic is a physical characteristic of an organism that is related to or derived from its sex, but not directly part of its reproductive system. [1]
The Hodgkin cycle represents a positive feedback loop in which an initial membrane depolarization leads to uncontrolled deflection of the membrane potential to near V Na. The initial depolarization must reach or surpass a certain threshold in order to activate voltage-gated Na + channels .
Original file (775 × 1,204 pixels, file size: 172.51 MB, MIME type: application/pdf, 1,286 pages) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
Download as PDF; Printable version ... excitation is a form of positive feedback. ... in the public domain from page 1061 of the 20th edition of Gray's Anatomy (1918)
The sodium influx eventually overtakes the potassium efflux (via the two-pore-domain potassium channels or leak channels, initiating a positive feedback loop (rising phase). At around +40 mV, the voltage-gated sodium channels begin to close (peak phase) and the voltage-gated potassium channels begin to open, moving potassium down its ...
Neurotransmitters represent another example of a paracrine signal. Some signaling molecules can function as both a hormone and a neurotransmitter. For example, epinephrine and norepinephrine can function as hormones when released from the adrenal gland and are transported to the heart by way of the blood stream.
An example is a system in which a protein P that is a product of gene G "positively regulates its own production by binding to a regulatory element of the gene coding for it," [14] and the protein gets used or lost at a rate that increases as its concentration increases. This feedback loop creates two possible states "on" and "off".