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Review your understanding of cell parts and functions in this free article aligned to NGSS standards.
•All cells have a cell membrane that separates the inside and the outside of the cell, and controls what goes in and comes out. The cell membrane surrounds a cell’s cytoplasm, which is a jelly-like substance containing the cell’s parts.
•Cells contain parts called organelles. Each organelle carries out a specific function in the cell. A cell’s organelles work alone and together to keep the whole cell functioning.
•Mitochondria are organelles that break down sugars. This process releases energy that the cell can use.
•The nucleus is an organelle that contains a cell’s genes.
•Chloroplasts are organelles that carry out photosynthesis, which makes the food plant cells need to live. This food is in the form of sugars.
•Plant cells have chloroplasts and a cell wall, but animal cells do not. The plant cell wall is outside the cell membrane, and it provides structure for the cell.
A motor unit consists of the motor neuron and the grouping of muscle fibers innervated by the neuron. The number of muscle fibers within a motor unit varies, and is a function of the muscle’s ability for accurate and refined motion.
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