a methylated guanine nucleotide added to the 5' endof eukaryotic mRNA. The cap is necessary to initiate translation of mRNA
The band of the sarcomere that extends the full length of the thick filament. The A band includes regions of thick and thin filament overlap, as well as a region of thick filament only. A bands alternate with I bands to give skeletal and cardiac muscle a striated apperance. The A band does not shorten during muscle contraction.
Absolute refractory period
A period of time following an action potential during which no additional action potential can be evoked regardless of the level of stimulation. (usually because Na+ channel closed whle K+ efflux)
The three glands in the male reproductive system that reproduce semen: the seminal vesicles, the prostate
In the GI tract, organs that play a role in
digestion but not directly part of the alimentary canal. These include the liver, the gallbladder, the pancreas, adn the salivary glands.