Which describes the function of the human sperm cell’s structure? a. the nucleus contains all 46 chromosomes. b. the tail allows it to travel to the egg. c. the head contains a basic substance that counteracts acidic substances in the vagina. d. the sperm’s structure allows it to live for two weeks in the vagina.

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

The combining form leuk/o means red true or false