upâ¢stream. 1. toward or in the higher part of a stream; against the current. 2. directed or situated upstream. 3. against or opposite to the direction of transcription, translation, or synthesis of a DNA, RNA, or protein molecule.dv. 1. Toward or closer to the source of a stream; in the direction opposite to that of the current: paddling upstream. 2. At an earlier point in a production process or supply chain. adj.
Positive feedback mechanisms. A positive feedback mechanism is the exact opposite of a negative feedback mechanism. With negative feedback, the output reduces the original effect of the stimulus. In a positive feedback system, the output enhances the original stimulus.
in blood bressure. Imoulses are sent to the control center In the brain that interprets the inout and then sends impulses to decrease heart rate and dilate the blood vessels to restore blood pressure to normal levels thus maintaining homeostasis. Any inout that negates the original stimuls is called neagative feedback