What role do calcium and atp play in muscle contraction?

Asap many people try to eliminate fat from their diets which is one reason it is necessary for humans to eat fat a) fat is the only way to get energy b) every cell in the body must contain fat c)fat stores less energy than polysaccharides d) saturated fats make blood vessels healthier

How do demetri's results show that digestive enzymes are crucial to maintaining homeostasis inside the body?

How many neutrons does element x have if its atomic number is 29 and its mass number is 86?