In biological systems, of molecules, such as glucose, yield the energy necessary for cellular processes to occur. This energy, called , is stored in the chemical bonds of organic molecules. If free energy is release when oxidation occurs then this reaction is considered .

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

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms

The negative impacts of nonnative species generally outweigh the positive impacts