Human Organs: Digestive Enzymes, Bacteria & Functions

Digestive organs secrete essential enzymes like amylase and protease to process food. Understand the roles of the skeleton and the impact of bacteria on organs.

Science student looking through microscope in the lab

A List of Bad Bacteria

Published Aug,14 2017 | By Valerie Liles

Bacteria are the oldest and most abundant life form on Earth. These microscopic, single-celled organisms live in all environments -- including in and on the human body. A study published in May 2016 in the "Proceedings of the National Academy of Sciences of the U.S.A."