The arrows indicate the flow of air in of the human body through the respiratory system organs. In the above diagram, the air at first enters through the nose, then flows through the nasal cavity, pharynx, larynx, trachea, and then into the lungs through the Bronchi.
The endocrine system gets some help from organs such as the kidney, liver, heart and gonads, which have secondary endocrine functions. The kidney, for example, secretes hormones such as erythropoietin and renin.
2. The hormone __________, which is secreted by cells of the thyroid gland, works with the parathyroid hormone to regulate the calcium levels in the blood and tissues. calcitonin. 3. The __________ gland secretes hormones that control the activity of the other endocrine glands.pituitary.4.The hormone __________ is secreted by the adrenal medulla and stimulates the sympathetic nervous system.. The __________ gland secretes hormones that control the activity of the other endocrine glands. pituitary. 4. The hormone __________ is secreted by the adrenal medulla and stimulates the sympathetic nervous system.