But there is feedback :
adrenals to hypothalamus to pituitary to adrenals.
Adrenaline
Yes. The adrenal glands are ductless glands.
Yes.
The adrenal glands are endocrine glands. Endo means "in". Exo means "out". So adreanal glands are endocrine glands because the hormones they produce work in the body and not out.
Probably because they secrete adrenaline which prepares you for fights.