Compare the two pictures given in the assignment and explain in which case the reaction to stimulation is carried out humoral, and in which – by the transmission of a nerve impulse.
In the first experiment, the stimulation is humoral. Humoral regulation is one of the early evolutionary mechanisms of regulation of vital processes in the body, carried out through the body’s fluids (blood, lymph, tissue fluid, saliva) with the help of hormones secreted by cells, organs, and tissues.
Hydra has nerve cells that transmit nerve impulses.
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