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The endocrine system secretes hormones into the bloodstream from glands throughout the body. Hormones travel in the blood stream to specific target organs, where they have an effect.

Hormones regulate the menstrual cycle. This involves the monthly release of an egg from the ovary and the build-up and breakdown of the lining of the uterus.

³ÉÈË¿ìÊÖostasis is the regulation of internal conditions inside cells or organisms, to create the optimum conditions for cell function.

Understanding how to approach exam questions helps to boost exam performance. Question types will include multiple choice, structured, mathematical and practical questions.