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Answer:

(18) - Thymosin α1 stimulates the development of precursor T cells in the thymus to mature T cells. Of the thymosin peptide family, thymosin β4, is the most abundant member and is also expressed in many cell types.

(19) -ALTHOUGH it is now generally accepted that in mammals the hormones of the posterior pituitary, vasopressin and oxytocin, are synthesized in the hypothalamus in the supraoptic (SON) and paraventricular (PVN) nuclei1, two important and related questions about the hypothalamo-neurohypophysial system (HNS) remain ...

(20) -Calcitonin is a 32 amino acid peptide hormone secreted by parafollicular cells of the thyroid gland in humans, and in many other animals in the ultimopharyngeal body. It acts to reduce blood calcium, opposing the effects of parathyroid hormone. Calcitonin has been found in fish, reptiles, birds, and mammals.

(21) -Mechanism. CRH is released from the hypothalamus. CRH stimulates the anterior pituitary to release ACTH. ACTH acts on the adrenal cortex to release cortisol and androgens.

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