When deciding which type of pump to use on a forest fire, which question would be the least important to ask first?
A
How high does the water need to pump?
se
ning
y for
B
Is water available for use that is free of sand and grit?
Do we have time to prime the pump before beginning?
D
How many additional parts are required for optimal functioning?

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

Which characteristics are typical of a human population in the postindustrial stage?

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna