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The complement protein pathway is responsible for assisting the immune system through each of the following mechanisms except:

Pelvic inflammatory disease often leads to: 

________ and _________ stimulate the build-up of the endometrium to receive an early embryo.

The _________ is responsible for forming the digestive tract and urinary tract.

Compared to plasma, glomerular filtrate should have _________.

Once a sperm enters a secondary oocyte, __________.

Na + is always reabsorbed in the ___________ but is only reabsorbed in the ___________ under hormonal influence.

The nephrons that play an important role in maintaining water content of the blood are called ___________ nephrons.

The _________ becomes part of the umbilical cord, produces formed elements of blood, and brings umbilical blood vessels to the placenta.

The life stageat which the reproductive organs become capable __________.