One group of scientist used the technology in a space shuttles main fuel engine to design a model of an artificial heart pump. based on this scenario, what dose the scientists model demonstrate?

a) space technology impacts life on earth
b) scientific technologies are always tested on humans
c) scientific technologies are independent of each other
d) space technology can be better used in other fields of science

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

All ova contain sex chromosomes corresponding to: x y xx xy

Describe characteristics of a good respitory surface