A fatty layer secreted by Schwann cells is

The major part of the pancreas is

A. ducted

B. fluid filled

C. ductless

D. non fluid filled

A specific messenger molecule synthesized by an endocrine gland is

A. enzyme

B. hormone

C. chemical

D. activator

In positive feedback, the rate of a process

A. increases

B. remains constant

C. changes

D. decreases

The hormones secreted by islets of Langerhans are

A. estrogen and progesterone

B. calcitonin and oxytocin

C. insulin and glucagon

D. vasopressin and oxytocin

Skeletal muscles, thinking, intelligence and emotions are controlled by

A. cerebellum

B. cerebrum

C. hypothalamus

D. thalamus