The document describes the main organelles found in animal cells and compares each one to something familiar. It explains that the endoplasmic reticulum transports proteins, the ribosomes make proteins, mitochondria provide energy, the Golgi body packages and distributes proteins, lysosomes break down unneeded materials, the cell membrane controls what enters and exits the cell, the cytoplasm is a jelly-like fluid that fills the cell, and the nucleus holds the cell's genetic information.