Describe the size and scale of an atom. explain the relative size of the nucleus in relation to the size of the entire atom.

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

Categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. makes predictions

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur