Human Endocrine Glands Ductless glands transport hormones in the blood Duct glands are exocrine glands that use tubes to carry the secretion (salivary, tears) Pituitary gland and Hypothalamus serve to link the nervous system other glands and metabolic functions. Thyroid and Parathyroid help regulate calcium metabolism Feedback! Goiter: Iodine deficiency and feedback causes the thyroid to enlarge This people have a goiter, a condition that is easily preventable with iodized salt Thyroid regulates metabolism Graves disease: hyperthyroid feedback Pancreas helps regulate blood glucose Insulin from Beta cells reduce blood sugar Glucagon from Alpha cells increase blood sugar feedback Large amount of adrenaline pumped into the body to put us in a state of increased alertness Blood is redirected away from the extremities to the large muscles of the body The heart starts working harder to move the blood to the large muscle groups as quickly as it can Increase in Respiratory Rate Release of red blood cells Release of sugar by liver Increase in metabolic rate THE FIGHT OR FLIGHT MECHANISM alektorophobia Gonads: Testes and Ovaries produce hormones that regulate secondary sex traits Male sex traits include those changes that occur during puberty Androgens include testosterone feedback Female sex traits include the menstrual cycle and the changes seen during puberty LH and FSH from the pituitary Estrogen and progesterone from the ovary feedback Identify the Glands