![]() Early biologists saw cells as simple membranous sacs containing fluid and a few floating particles. Ideas about cell structure have changed considerably over the years. the stomach is an organ, and so is the skin, the brain, and the uterus). Various tissues organized together for a common purpose are called organs (e.g. When many identical cells are organized together it is called a tissue (such as muscle tissue, nervous tissue, etc). There are about 200 different kinds of specialized cells in the human body. An adult human body is composed of about 100,000,000,000,000 cells! Each cell has basic requirements to sustain it, and the body's organ systems are largely built around providing the many trillions of cells with those basic needs (such as oxygen, food, and waste removal). bacteria and protozoans), but animals, including human beings, are multi-cellular. Some organisms are made up of just one cell are called unicellular. Every living thing has cells: bacteria, protozoans, fungi, plants, and animals are the main group of living things. 4.1.3 Nicotinamide Adenine Dinucleotide (NADH)Ĭell Structure and Function What is a Cell? Ī cell is a structure as well as a functional unit of life.4.1.2 Flavin Adenine Dinucleotide (FAD).1.4.4 Active Transport Across the Cell Membrane.1.4.3 Passive Transport Across the Cell Membrane.1.2 Specialized Cells of the Human Body. ![]()
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