A three-nucleotide sequence in mRNA that specifies a particular amino acid or polypeptide termination signal; basic unit of the genetic code. In translation, an mRNA codon is â¦ recognized by its complementary tRNA anti-codon.
Epinephrine is an important cell signaling molecule in the fight or flight response. Also known as adrenaline, epinephrine is an efficient messenger that signals many cell types throughout the body with many effects. In the lungs, epinephrine binds to receptors on smooth muscle cells wrapped around the bronchioles.his increases the rate at which other chemical signals, glucose and oxygen are circulated to the cells that need them. Epinephrine also contracts specific types of muscle cells below the surface of the skin, causing beads of perspiration and raised hairs at the surface.
Epinephrine, or adrenaline, is a hormone released by the adrenal glands as part of a âfight or flightâ response. Its function is to prepare the body to flee or fight back.