- Doctorate - 4-7 years, including doctoral dissertation. You can do a Phd. right from 4 year college without getting a masters first, but most people get the masters first. MD - Medical Doctor - Med school and internship, done after BS or BA degree - can take 8 years.
Because of the relationship between the dihydropyridine receptor and the ryanodine receptor, that causes calcium that is stored in the sarcoplasmic reticulum to be released, and the calcium released then causes muscle contraction.
Agonist and Antagonist Muscles Summary. Agonist / prime mover â muscle directly responsible for the movement at a joint. Antagonist â muscle that is relaxing and has the. opposite action. to the agonist. AGONIST (prime mover) ANTAGONIST (relaxed)