Dec 10, 2025 · What is a cell? A cell is a mass of cytoplasm that is bound externally by a cell membrane. Usually microscopic in size, cells are the smallest structural units of living matter and …

Jun 14, 2025 · Explore the structure, types, and functions of cells in this student-friendly guide to cell biology and cell theory.

Cell theory, developed in 1839 by Matthias Jakob Schleiden and Theodor Schwann, states that all organisms are composed of one or more cells, that cells are the fundamental unit of structure and …

From organelles to membrane transport, this unit covers the facts you need to know about cells - the tiny building blocks of life. Explore the structures and functions of major eukaryotic cell organelles.

Aug 1, 2025 · Delve into the complex internal architecture of cells. Explore how their specialized structures work together to perform life’s vital functions.

Dec 30, 2025 · A cell is the smallest, fundamental unit of life and is responsible for all life's functions. It is the basic biological, structural, and functional components of all living things.

All living structures of human anatomy contain cells, and almost all functions of human physiology are performed in cells or are initiated by cells. Even bacteria, which are extremely small single celled, …

There are many different types, sizes, and shapes of cells in the body. For descriptive purposes, the concept of a "generalized cell" is introduced. It includes features from all cell types. A cell consists of …

Cells fall into one of two broad categories: prokaryotic and eukaryotic. The predominantly single-celled organisms of the domains Bacteria and Archaea are classified as prokaryotes (pro- = before; -karyon …

Jul 18, 2023 · Living things consist of tiny living parts or compartments called cells. A cell itself consists of certain tiny parts or structures called organelles. These organelles perform various life functions …