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Human Cell Biology Organelle Structure and Function Rachel Black Chesterfield College Topic Organelle Structure and Function Aims Basic overview to introduce Cell Organelles Level Level 3 Method All PowerPoint slides introducing Cell Organelles, Human Cell Biology, Levels of Organisation, Identify the Organelle, Nucleus, Endoplasmic Reticulum, Ribosomes, Golgi Body, Lysosome, Mitochondria. Can be shown as a slide show and students to take notes, or can be hand-outs for the students. Equipment Laptop/Projector Printer Plain Paper Printer Duration >30 Minutes Human Cell Biology • Lesson Objectives: – Explain how the functions of the nucleus, endoplasmic reticulum, ribosomes, mitochondria, Golgi body and lysosomes are linked to their structure. Levels of Organisation Body Systems Organs Tissues Cells This is the level that we will be exploring Identify the Organelle Golgi Body Cell Membrane (Plasma Membrane) Mitochondria Nucleus Lysosome Rough ER Cytosol Ribosomes Smooth ER Nucleus Structure Function • Bound by a double membrane (nuclear Controls substances entering and exiting membrane or envelope) the nucleus. • Nuclear membrane has nuclear pores. Allows the passage of large molecules out of the nucleus. • Contains the jelly-like nucleoplasm. Contains chromatin (coils of DNA bound to protein) During cell division, chromatins condense to form chromosomes (Contain DNA). • Inside the nucleus is the round nucleolus. Manufactures RNA which is needed to make ribosomes & proteins. • Nucleus very prominent feature of the cell. Usually 1 per cell. Endoplasmic Reticulum Structure Function A system of hollow tubes and sacs, created by folds of a double membrane. Allows transport of materials within the cell and between cells. Ensures proteins are folded correctly. The fluid filled spaces between the membranes are called cisternae. These cavities are connected. Rough ER has ribosomes attached to its outer surface. Provides a large surface area for chemical reactions. Contains and transports proteins made by ribosomes. Prevents proteins diffusing out into cytosol. Smooth ER has no ribosomes on its outer surface. Synthesis and transport of steroids & lipids (fats) Joined to the nuclear envelope. Allows easy transport of RNA from the nucleus to manufacture proteins in the ribosomes. Endoplasmic Reticulum Ribosomes Structure Function Small & dense and present in great numbers. Can be attached to rough ER or free floating. Site of protein synthesis. DNA is a set of instructions for how to make proteins. Consists of a large and small subunit. The nucleus sends out a copy of these instructions as mRNA. The ribosomes ‘read’ the mRNA, which tells it what protein to make. Ribosomes shape and composition Golgi Body Structure Function Formed from rough ER ‘pinching off’ at the sides to form vesicles which then fuse together to form a tightly packed group of flattened cavities. Modifies chemicals to make them functional. E.g. carbohydrates are added to proteins to make glycoproteins such as mucus when can then be secreted out of the cell via vesicles. It is constantly shifting, receiving vesicles from the side nearest the nucleus (the forming face) and loosing vesicles from the side nearest the cell membrane (the maturing face). Secretes chemicals in tiny vesicles. Forms lysosomes. Golgi Body Lysosome Structure Function Small vacuoles formed from portions of the Golgi body that have ‘pinched’ off. Contain digestive enzymes called lytic enzymes, which can destroy old and worn out cell structures. Membrane prevents digestive enzymes leaking out and potentially destroying vital cell components. Digests material taken into the cell e.g. white blood cells engulf bacteria and the lytic enzymes in the lysosomes destroy the harmful bacteria. Mitochondria Structure Function Oblong shaped. Site of cellular respiration which is the process of making ATP (energy) which cells need to survive and function. Has a double membrane. A smooth outer membrane and a folded inner membrane. The folds give a large surface area. These folds create extensions called cristae. Contains a fluid known as the matrix which contains various chemical compounds such as protein and lipids. Has it’s own DNA so can control its own protein synthesis. Folds provide a large surface area for the chemical reaction that produces ATP.