When a ball rolls down the hill, what energy is conserved?

a. potential energy to chemical energy.
b. potential energy to kinetic energy.
c. chemical energy to kinetic energy.
d. kinetic energy to potential energy.

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

Isotopes of the same element have differ in their

What is the membrane that sheath of schwann cell containing cytoplasm and nucleus that encloses myelin