Chapter 3 Cells - Quia

Chapter 3 Cells - Quia

Chapter 3 Cells vary in size possess distinctive shapes measured in micrometers 1 A Composite Cell hypothetical cell major parts nucleus

cytoplasm cell membrane 2 Cell Membrane outer limit of cell controls what moves in and out of cell selectively permeable phospholipid bilayer water-soluble heads form surfaces water-insoluble tails form interior permeable to lipid-soluble substances

cholesterol stabilizes the membrane proteins receptors pores, channels, carriers enzymes CAMS self-markers 3 4 Cell Membrane

5 Intercellular Junctions Tight junctions close space between cells located among cells that form linings Desmosomes form spot welds between cells located among outer skin cells Gap junctions tubular channels between cells

located in cardiac muscle cells 6 Cell Nucleus control center of cell nuclear envelope porous double membrane separates nucleoplasm from cytoplasm nucleolus dense collection of RNA and proteins

site of ribosome production chromatin fibers of DNA and proteins stores information for synthesis of proteins 7 Cytoplasmic Organelles Endoplasmic Reticulum connected, membrane-bound sacs, canals, and vesicles transport system rough ER

studded with ribosomes protein synthesis smooth ER lipid synthesis added to proteins arriving from rough ER break down of drugs Ribosomes free floating or connected to ER provide structural support 8

Cytoplasmic Organelles Golgi apparatus stack of flattened, membranous sacs modifies, packages and delivers proteins Vesicles membranous sacs store substances Mitochondria membranous sacs with inner partitions generate energy

9 Cytoplasmic Organelles Lysosomes enzyme-containing sacs digest worn out cell parts or unwanted substances Peroxisomes enzyme-containing sacs break down organic

molecules Centrosome two rod-like centrioles used to produce cilia and flagella distributes chromosomes during cell division 10 Cytoplasmic Organelles Cilia short hair-like projections

propel substances on cell surface Flagellum long tail-like projection provides motility to sperm 11 Cytoplasmic Organelles Microfilaments and microtubules thin rods and tubules support cytoplasm allows for movement of organelles

Inclusions temporary nutrients and pigments 12

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