The main center for control of the internal environment of the body takes place in the .
a. adrenal glands
b. thyroid gland
c. cerebellum
d. hypothalamus and pituitary
e. medulla

D

Explanation:

the hypothalamus is part of our brain that control our body temp, heart rate etc

pituitary is the master gland controlling the other glands in your endocrine system

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation: