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It explains how homeostasis maintains stable internal conditions and how cell membranes regulate transport, recognition, protection, and anchoring. The review distinguishes diffusion types (simple diffusion and osmosis) and compares isotonic, hypotonic, and hypertonic solutions. It also addresses energy conversions across membranes, passive diffusion, facilitated diffusion via transport proteins, and active transport using ATP, including examples like Na+-K+ pumping and channel and carrier protein roles.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":20,"@type":76,"position":81},"https://docshare.wps.com/document/exam/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/biology-staar-eoc-review/483615/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/biology-staar-eoc-review/483615.png","ImageObject",300,407,{"name":92,"@type":93},"Theodore","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-08","2026-09-30",true,{"@type":102,"interactionType":103,"userInteractionCount":39},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What is homeostasis and why is it important for cells?","Question",{"text":112,"@type":113},"Homeostasis is the process by which organisms keep internal conditions relatively stable despite external changes. Cell survival depends on internal conditions remaining suitable for life processes.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What are the main functions of the plasma/cell membrane?",{"text":117,"@type":113},"The plasma membrane acts as a protective barrier and regulates selective transport in and out of the cell. It also supports cell recognition, anchors cytoskeleton filaments, and provides binding sites for enzymes.",{"name":119,"@type":110,"acceptedAnswer":120},"How do simple diffusion and osmosis differ in transport across membranes?",{"text":121,"@type":113},"Simple diffusion moves molecules from high to low concentration without energy. Osmosis is the diffusion of water across a membrane, moving from high water potential (low solute) to low water potential (high solute).","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},483615,1791095107,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":19,"category_name":20,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":39,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},7971461740886,"https://ap-avatar.wpscdn.com/davatar_3d24733baf745e90a7e4bdd5f77d97b2","Magee’s Biology STAAR EOC Review  \n\n| Reporting Category 1: Cell Structure and Function |  |\n| --- | --- |\n| STAAR -11 Questions STAAR M-9 Questions 4 Readiness Stds 5 Supporting Stds |  |\n| 􀁸 Biology is the study of life and living organisms.\u003Cbr>􀁸 An organism is a complete, individual, living thing.\u003Cbr>􀁸 All organisms are formed from the same basic building block – cells. |  |\n| TEKS (RS)-will be tested (65%)(SS) -may be tested (35%) | Key Ideas\u003Cbr>Cells are the smallest units of living things\u003Cbr>Simple cells are called prokaryotic; Complex cells are called eukaryotic\u003Cbr>Cell Parts or Organelles\u003Cbr>Cell membrane Surrounds the cell; controls what enters/leaves the cell; recognizes other cells; maintains homeostasis Cytoplasm Suspends organelles in a eukaryotic cell; enclosed within the cell membrane Nucleus Controls the cell’s activities; contains chromosomes made of DNA Mitochondria Breaks down food to release energy Endoplasmic reticulum (smooth or rough) Moves substances within the cell (pipe-like structures) Ribosome Makes proteins; round structures located in rough endoplasmic reticulum Golgi body or complex Changes and packages cell products Lysosome Contains enzymes (proteins that speed up digestion and chemical reactions) vacuole Holds material like water; large in a plant cell Plant cells only Cell wall Surrounds the cell membrane; supports and protects plant cell chloroplast Contains chlorophyll (green pigment) for photosynthesis |\n|  |  |\n\n\n| 4B Investigate and explain cellular processes, including homeostasis, energy conversions, transport of molecules, and synthesis of new materials (RS) | Cellular Processes\u003Cbr>I. Homeostasis is a process by which organisms keep internal conditions relatively stable regardless of changes in the external environment. It is important because the processes that keep the cell alive can only take place under certain internal conditions.\u003Cbr>• Balanced internal condition of cells\u003Cbr>• Homeostasis is also called equilibrium\u003Cbr>• Maintained by plasma membrane controlling what enters & leaves the cell\u003Cbr>Plasma or Cell Membrane\u003Cbr>The cell membrane is flexible and allows a unicellular organism to move |  |  |\n| --- | --- | --- | --- |\n|  | | | |\n|  | When you transport something, you move it from one place to another. Cells transport materials across the cell membrane.\u003Cbr>Functions (what they do) of Plasma or Cell Membrane\u003Cbr>􀀹 Protective barrier\u003Cbr>􀀹 Regulate transport in & out of cell (selectively permeable-only lets some things and out of the cell like a club bouncer; Specifically, small molecules and larger hydrophobic molecules move through easily. e.g. O2, CO2, H2O; Ions, hydrophilic molecules larger than water, and large molecules such as proteins do not move through the membrane on their own.\u003Cbr>􀀹 Allow cell recognition\u003Cbr>􀀹 Provide anchoring sites for filaments of cytoskeleton\u003Cbr>􀀹 Provide a binding site for enzymes\u003Cbr>􀀹 Interlocking surfaces bind cells together (junctions)\u003Cbr>􀀹 Contains the cytoplasm (fluid in cell)\u003Cbr>Structure of the Cell Membrane\u003Cbr>|  |  |\n\n\n|  | Cell Membrane | |  |\n| --- | --- | --- | --- |\n|  | 􀁸  Polar heads are hydrophilic “water loving”\u003Cbr>􀁸  Nonpolar tails are hydrophobic “water fearing”\u003Cbr>Makes membrane “Selective” in what crosses- “Selectively permeable”\u003Cbr>\u003Cbr>II. Types of Transport Across Cell Membranes\u003Cbr>Simple Diffusion\u003Cbr>Requires NO energy; Molecules move from area of HIGH to LOW concentration DIFFUSION |  |  |\n|  | | Diffusion is a PASSIVE process which means no energy is used to make the molecules move, |  |\n|  | they have a natural KINETIC ENERGY\u003Cbr>Ex: Diffusion of Liquids Diffusion through a Membrane |  |  |\n|  | |  | |\n|  | Solute moves DOWN concentration gradient (HIGH to LOW) |  |  |\n\n\n|  | Osmosis-Diffusion of water across a membrane\u003Cbr>Moves from HIGH water potential (low solute) to LOW water potential (high solute) |  |\n| --- | --- | --- |\n|  | | Diffusion of H2O Across A Membrane\u003Cbr>|\n|  | Cells in Different Solutions (Think of a p","cbCainGlBeHsZ0t0","https://ap.wps.com/l/cbCainGlBeHsZ0t0","pdf",4751674,62,"English","# Cell Structure and Function\n## Cellular Processes and Homeostasis\n## Transport Across Cell Membranes\n## Types of Transport: Diffusion, Osmosis, Active Transport\n## Transport Proteins and Membrane-Related Processes","[{\"question\":\"What is homeostasis and why is it important for cells?\",\"answer\":\"Homeostasis is the process by which organisms keep internal conditions relatively stable despite external changes. Cell survival depends on internal conditions remaining suitable for life processes.\"},{\"question\":\"What are the main functions of the plasma/cell membrane?\",\"answer\":\"The plasma membrane acts as a protective barrier and regulates selective transport in and out of the cell. It also supports cell recognition, anchors cytoskeleton filaments, and provides binding sites for enzymes.\"},{\"question\":\"How do simple diffusion and osmosis differ in transport across membranes?\",\"answer\":\"Simple diffusion moves molecules from high to low concentration without energy. Osmosis is the diffusion of water across a membrane, moving from high water potential (low solute) to low water potential (high solute).\"}]","Biology STAAR EOC Review | PDF",1790800952,156]