APHY 102 Midterm Questions and Verified Answers | Passed | A+

What is a hormone and how does it act? : Hormones are chemical messengers that are responsible for regulation. They are secreted into body fluids, mainly blood. It has specific actions on target tissues, which are any tissue that has specific receptors for that particular hormone. Understand the role of negative feedback in control of hormone secretions. : A control mechanism in which rising level of a hormone leads to a decrease in hormone secretion What is a paracrine secretion? : glands that secrete messenger molecules that affect nearby cells What is an autocrine secretion? : glands that secrete messenger molecules that affect cells that secrete substances 2 What is an exocrine gland? : a gland that produces and secretes substances into ducts that lead to body surfaces; external What is an endocrine gland? : A gland that secretes a substance (a hormone) into the bloodstream, acting only on target cells; internal