growth hormone. somatotropin. close-up of a hypothalamus and pituitary gland

growth hormone somatotropin brain closeup hypothalamus pituitary gland posterior anterior acromegaly excessive bones gh deficiency dwarfism retardation human hgh peptide medical vector diagram silhouette ghrh somatostatin endocrine system adenoma gigantism igf1 insulinlike factor hormonal regulation secretion therapy function disorder imbalance education science