How does the endocrine system affect the body's functions? It secretes enzymes directly into the bloodstream.
It secretes hormones direcuy into the bloodstream.
It secretes enzymes through ducts to the surface of organs.
It secretes hormones through ducts to the surface of organs.

B.) It secretes hormones directly into the bloodstream.

teens need 8-10 hours of sleep. it kind of depends on what time you get up. but prob around 10 or 11 p.m. or 11 or 11: 30 p.m.

well say a good goal is to do 150 sit ups in a week! or 90 pull ups a day. even 60 push ups in a month these are all fair goals!