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Epithelial Cells form Epithelial Tissue • Structure: – Epithelial Cells pack tightly together and form continuous sheets that line different parts of the body. • Function: – Protection, secretion, absorption, and transport • Examples: – Inside the mouth (cheek cells) – Line organs like the stomach – Surround the outside of organs – Make the outer layer of skin MUSCLE TISSUE • Structure: – Muscle cells make specialized tissue that can contract. – Muscle tissue contains the specialized proteins actin and myosin that slide past one another. • Function: – Allows for movement of limbs and contraction. • Examples: – Heart – Cardiac Muscle – Body Movement—Skeletal Muscle – Digestive Tract, Veins/Arteries, Bladder—Smooth Muscle NERVE TISSUE • Structure: – Elongated cells with many branches. • Function: – Has the ability to generate and conduct electrical signals in the body. – These signals are managed by the brain and transmitted down the spinal cord to the body. White Blood Cell • Structure: – Large, flexible cells – Covered in proteins that recognize invaders. • Function: – Part of your immune system. – Fight off bacteria and other invaders. • Examples: – Neutrophils – engulf bacteria – Basophil – Release histamine to promote and inflammatory response. Plant Leaf vs. Plant Stem • Leaf – Contains Guard Cells that open and close to allow for gas exchange – Lined with Chloroplasts • Stem – Contain Xylem and Phloem that carry food and water up the stem of the plant. Levels of Organization 1. Cells 2. Tissues – groups of individual cells 3. Organs – groups of tissues working together 4. Organ Systems – groups of organs that work together for a specific function 5. Organism