Hyposecretion is when there is too little hormone. Hypersecretion is when there"s too much hormone. Primary hyposecretion: when there is too little hormone due to a gland abnormality. Dietary (ex: iodine is required for secretion of th) Chemical or toxic (ex: free radicals, x-rays) Secondary hyposecretion: when the gland is normal and the hormone abnormality is to to a lower amount of trophic hormone. Tumours which can cause continuous secretion of excess hormone. Primary hypersecretion: too much hormone due to abnormality within the gland. Secondary hypersecretion: caused by excessive stimulation to the gland. Secretes trophic hormones that control the anterior pituitary. Anterior looks more glandular because it makes and secretes its own hormones. Posterior receives hormones from the hypothalamus and stores them until an action potential stimulates release. Anterior pituitary secretes 6 peptide hormones (5 are trophic) Fsh (follicle-stimulating hormone) promotes egg and sperm production. Lh (luteinizing hormone) promotes estrogen and testosterone secretion from gonads as well as ovulation.