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Transcript
The Different Jobs of Cells 2.2 I. Special Cells for Special Jobs • Cells that make up many-celled organisms are specialized • Bacteria cells are single celled, all other cells are “many celled” organisms A. Types of Human cells • A cell’s shape and size can be related to its function • FAT CELLS – can store so much fat that the nucleus gets pushed against the cell membrane Skin Cells • Are mostly flat and close together. They form a protective layer for your body Bone Cells • Bone cell is surrounded by a hard substance made of calcium and phosphorus Muscle Cell • Muscle cells are usually long and have many fibers that can contract and relax Nerve Cell • Nerve cells are long and have many branches. This allows them to receive and deliver messages B. Types of Plant Cells • Plants have different type of cells in their leaves, roots, and stems • Root Cells are block shaped and do not contain chloroplasts Plant Stem Cells • Stem Cells - Many of the cells in stems are long and tubshaped. They move water and other materials through the plant II. Cell Organization • Cells are organized into systems that perform functions that keep the organism healthy and alive A. Tissues and Organs • Cells that are alike are organized into tissues – Tissues are groups of similar cells that all do the same sort of work • Different types of tissues working together can form an organ B. Organ Systems • A group of organs that work together to do a certain job is an organ system • Organ systems in the human body include: – Digestive system, respiratory system, circulatory system, reproductive system and nervous system