17. Which of the following happens first as a nephron processes blood?
A. reabsorption
B. excretion
C. osmosis
D. filtration
E. secretion

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

Identify any four organelles that should be present in the eukaryotic organism and describe the function of each organelle

Regarding most of the narrator’s story, which word best describes the tone?