Cell, tissue, organ and organ system
Most people know that a major function of the kidneys is to remove waste products and excess fluid from the body. These waste products and excess fluid are removed through the urine. The production of urine involves highly complex steps of excretion and re-absorption.
It is the main endocrine gland and a small structure in the head. It's named the "master gland" because it produces hormones that control other glands and many other body functions including growth. It consists of the anterior and posterior pituitary.
Hope that this helps! Also nice username
Answer:
brain
I the brain is the basic scheme
Bio=life.
macro=large
micro=small
