Cambridge O Level Biology · Syllabus 5090 · Coordination and Control
Target Organ
What is Target Organ?
An organ whose activity is altered by a particular hormone. A hormone is carried in the blood to every organ, but only cells carrying receptors complementary to that hormone respond, so the response is specific even though the delivery is not.
This definition is part of the Coordination and Control chapter in Cambridge O Level Biology.
Questions students ask about Target Organ
What is a hormone?
A hormone is a chemical substance, produced by a gland and carried by the blood, which alters the activity of one or more specific target organs. Although a hormone reaches every organ in the body, only cells carrying receptors complementary to that hormone respond to it.
Last reviewed Syllabus 2026-2028