The chemoreceptors of the tongue respond to monosaccharides

Solution

Alkaloids are toxic produced by plants. They are bitter in taste and gives high sensitivity. The tongue contains special receptors for bitter taste at the back of it. Actually when we taste something toxic then nerve cells of tongue start sending signals to the brain and brain gives response whether it\'s good or bad for the body. Bitter substances stimulate the production of IP3(Inositol triphosphate) by taste cells.IP3 increases intracellular Ca2+ level which leads to the release of the synaptic transmitter and the activation of gustatory nerve fibers.