The purpose of capillary tubes is to: permit oxygen and nutrients to be absorbed by cells
allow blood to complete a path between arteries and veins
reverse the flow of blood
provide a means for cell wastes to enter the blood stream
3 Attempts Remain

Common commercial benefits of microorganisms include synthesis ofa. insulin.b. antibiotics.c. aspirin.d. antibiotics and aspirin.e. antibiotics and insulin.

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

Greenthe fossil record is the history of life recorded byhuman observationgod.climatologists.remains of the past.