Excretory and Endocrine Systems

A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

Excretory System
How the kidneys balance the amount of fluid in your body, detect waste in your blood, and know when to release the vitamins, minerals, and hormones you need to stay alive.

Endocrine System
The endocrine system is made up of glands, which release chemicals called hormones into the blood. The adrenal gland is an example of an endocrine gland.

Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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