Biology - Cells PDF

Cells ©TCL Keyword Definition Light Microscope: A device Cell...

Cells ©TCL Keyword Definition Light Microscope: A device Cell Basic unit of life. Unicellular organisms only have which uses light and a series of one cell. Multicellular organisms have many cells. lenses to produce a magnified image of an object. Cell Membrane Controls the movement of substances in and out of Magnification = How much the cell. bigger a sample/object appears under the microscope than it is Cytoplasm Jelly-like substance where chemical reactions take in real life. place. Total magnification = Eyepiece Nucleus Carries genetic information and controls the cell. lens x Objective lens Mitochondria Where respirations takes place. Cell Wall Made of cellulose, provides support to the cell. Vacuole Contains cell sap. Chloroplasts Contains the green pigment chlorophyll, the site of photosynthesis. Tissue Something made from just one type of specialised cell. Organ Something made from different groups of Diffusion: The movement of particles from an area of high Antagonistic Muscles: specialised cells all working together. concentration to an area of low concentration. - Muscles work by getting shorter. Organ System When a number of organs work together. Substances diffuse into and out of cells. - Muscles can only pull and can’t push. - Muscles work in pairs. - When you raise your forearm, the Bicep Synovial Joint A freely moveable joint. Examples include the hip, High biceps contract and the triceps relax. Tricep shoulder, elbow and knee joints. Concentration - When you lower your forearm, the biceps relax and the triceps contract. Further Reading: https://www.bbc.com/bitesize/guides/z9hyvcw/revision/2 Low Concentration Red Blood Cell Sperm Cell Root Hair Cell Palisade Cell Nerve Cell Egg Cell Carries blood around the Carries the male genes. Take in water from the Production of food for the Carry signals around the Carries the female genes. body. soil. plant. body. Adaptations: No nucleus, Adaptations: Tail for Adaptations: Long & thin; Adaptations: Tall and thin. Adaptations: Long axon. Adaptations: Lots of large surface area and swimming, mitochondria large surface area for Lots of chloroplasts to Myelin sheath. mitochondria. biconcave shape. for energy, acrosome to maximum water absorb sunlight for Outer layer hardens once break down the egg cell. absorption. Thin cell walls. photosynthesis. fertilised.