Examples of positive and negatice feedback loops – Flashcards

positive or negative feedback loop: maintaining a constant body temperature

contractions of the uterus during childbirth or the secretion of oxytocin which provides a pathway for the uterus to contract, leading to child birth

when a gene activates itself directly or indirectly via a double negative feedback loop

when a gene activates itself directly or indirectly via a double negative feedback loop

Blood clotting in which the platelets process mechanisms to transform blood liquid to solidify

lactation

when blood pressure increases, signals are sent to the brain from the blood vessels. Signals are sent to the heart from the brain and heart rate slows down, thus helping blood pressure to return to normal.

Production of human red blood cells (erythropoiesis) - A decrease in oxygen is detected by the kidneys and they secrete erythropoietin. This hormone stimulates the production of red blood cells.

A spike in estrogen during the follicular phase of the menstrual cycle causes ovulation.

In excitation-contraction coupling of the heart, an increase in intracellular calcium ions to the cardiac myocyte is detected by ryanodine receptors in the membrane of the sarcoplasmic reticulum which transport calcium out into the cytosol in a positive feedback physiological response.

Regulation of blood sugar in humans

When a human is hungry, metabolism slows down to conserve energy and allow the human to continue living with less food.