I need some questions answered!?

I can answer #1 and #4 but i don't know the others. For question 1, I believe that is the cochlea, and more specifically the hair cells in the organ of corti. And #4, the gland involved is the endocrine pancreas and it secretes alpha and beta cells. Alpha cells secrete glucagon to raise blood glucose level. Beta cells secrete insulin to lower blood glucose level.