A&P 102 Final Exam

Endocrine glands differ from exocrine glands in that endocrine glands? - Secretes hormones directly into a body fluid What is a hormone? - A chemical messenger that affects the functioning of certain cells in the body What endocrine gland is also considered an organ of the immune system? - Thymus gland What is a false statement about steroid hormones? - Their receptors are located on the cell membrane of their target cells What is a secondary messenger system of hormone action? - A method used by certain hormones to exert their effects on their target cells, often involving the activation of adenylate cyclase What method of regulation does the hypothalamus use to control hormone release from the anterior - It secretes releasing or inhibiting hormones into the hypophyseal portal system One method of regulating hormone secretion in the body is by the concentration of various ions or other substances in the body fluids. Which hormone is regulated by the concentration of Ca+2 in the blood? - Parathyroid hormone What is a false statement concerning negative feedback? - It is the regulatory method used by the hypothalamus to control epinephrine secretion