The two proteins directly involved in muscle contraction are broadly called . During an exercise where muscles do not shorten, contractions have occurred. a. has an affinity for myosin binding sites in the absence of calcium. b. is a missing protein in Duschenne's muscular dystrophy. c. The cell membrane of a muscle fiber is the .

the atomic number of magnesium is 12. its nucleus must contain 12 protons and no electrons. the atomic number of an atom is determined by the number of protons.

magnesium is an electrolyte injection commonly used to treat low magnesium levels in your blood. it is also used to prevent or control seizures in women with preeclampsia or eclampsia.

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.  

hi my name is ashlynn and im 15

these macromolecules could either be amino acids, proteins or nucleic acids. they are responsible for the chemical changes and reactions that affects largely the cell and its composition. take for instance the cytoplasm of the cell where these organelles are settled. these simple organelles are composed of macromolecules which ignites and catalyses different functions that enables cells, in macro-perspective in motion and metabolism. in intestines for example, metabolism happens and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components.