How do germ cell lines to persist after many rounds of cell division? O Telomerase enzymes adds to the shorted telomers preserving their length
O Telomerase enzymes ensure that the full length of DNA is copied at each replication cycle
O They do not differentiate
O Telomerase enzymes cap and protect the chromosomal ends preventing errosion

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.  

i guess because there isn't enough love going around. < 3

what questions are you talking about ?