What structures carry the action potentials into the interior of the muscle to cause muscle contraction?

Apart of the periodic table is shown. a portion of the sixteenth and seventeenth columns of the periodic table is shown. column 16 reads eight oxygen, 16 sulfur, and 34 selenium. column 17 reads nine flourine, 17 chlorine, and 35 bromine. which of the following elements is less reactive than the others? bromine (br) oxygen (o) selenium (se) sulfur (s)

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes

People with one sickle cell allele are not likely to get malaria. what is this an example of?