BIOL 101 (Human Anatomy and Physiology)

ATI TEAS 6 - Science (Human Anatomy and Physiology) Hierarchy of Structures Lowest Hierarchy level is at Organelles within a cell. They obtain energy from food and reproduction. -Cells with the same function are collected into larger groups called Tissues. -Tissues are collected into Organs, carry out single task, like oxygenated blood (lungs), or filter out waste (kidneys). -Organs work together in systems that perform coordinated large-scale functions, like nourishing the body (dige...