Can anyone explain capillary action in the circulatory system in simple terms?

In pea plants, the allele for inflated pod seed, i, is dominant over the allele for constricted pod seed, i. the punnett square shows a cross for this trait. which offspring will be homozygous dominant

What would happen if the tubing with the yellow band was placed in a beaker of distilled water?

How does the nervous system affect the excretory system?