From the statements given below choose the correct statement(s): I. Endocrine glands are…

From the statements given below choose the correct statement(s):

I. Endocrine glands are ductless and secrete hormones directly into the bloodstream.
II. Hormones are nutrient chemicals that act as intracellular messengers.
III. The classical definition of hormones includes only those secreted by organized endocrine glands.
IV. Hormones can be steroids, peptides, or amino acid derivatives.
V. All hormones interact with membrane-bound receptors and use second messengers.