Which statement best compares the energy transformation of photosynthesis and cellular respiration? A) only photosynthesis uses oxygen to create energy B) only photosynthesis causes an increase in kinetic energy C) photosynthesis and cellular respiration both store energy in chemical bonds D) photosynthesis and cellular respiration both require chemical energy to make food

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