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Cell Structure and Function
Basic Cellular Anatomy
25
Anatomy
12th Grade
09/13/2008

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Term
Nucleus
Definition
-Organelle containing genetic material (blueprint) which controls the cell
-Nuclear envelope
-Nuclear pores let things in and out
-Contains chromatin (loosely coiled DNA and proteins which tighten during cell division to form Chromatin).
Term
Cytoplasm
Definition
The living material surrounding the nucleus in the cell, which contains many other types of organelles
Term
Plasma Membrane
Definition
-Cell membrane/barrier, determines what moves in or out of the cell.
-Phospholipids, proteins, cholesterol, water, ions, and carbs
-Double layerd phospholid molecules have polar ends facing outwards.
-Membrane channels and carrier molecules allow materials in and out of cells.
-Receptor molecules allow for communication between in and outside.
Term
Nucleoli
Definition
-In the nucleus
-Round bodies with no membrane where subunits of ribosomes are manufactured
-Subunits consist of proteins put together in the Nucleolus to form rRNA and then released back into the cytoplasm
Term
Ribosomes
Definition
-After being released from the nucleoli one big and one small ribosome will pair to form one ribosome
-Produce proteins
-Some float freely, others in endoplasmic reticulum
Term
Endoplasmic Reticulum
Definition
-Series of membranes extending from outer nuclear membrane into cytoplasm
-Rough has ribosomes attached to it used for protein synthesis
-Smooth has no ribosomes used for lipid synthesis
Term
Golgi Apparatus
Definition
-Closely stacked membrane bound sacks
-Collects, modifies, packages, and distributes proteins and lipids made by ribosomes in the endoplasmic reticulum
Term
Exocytosis
Definition
-Removal of waste from the cell by the Golgi complex
-A vesicle (package) is pinched off from the Golgi Apparatus containing the waste material.
-Moves to the membrane, fuses with wall, and opens to the outside to dump its contents.
Term
Secretory Vesicles
Definition
-Small, membrane bound sac
-Transports or stores materials within cells
-Pinch off from Golgi Apparatus
Term
Lysosomes
Definition
-Membrane bound vesciles formed from Golgi Apparatus
-Contain enzymes that function as cell's digestive system
-Break down materials within cell
Term
Mitochondria
Definition
-Small bean shaped organells with inner and outer membranes.
-Smooth outer membrane, inner has folds called cristae.
-Produce ATP, major energy source for chemical reactions in cells.
Term
Cytoskeleton
Definition
-Proteins that support cell and hold organelles in place
-Microtubules hollow protein tubules that help in cell division and support the cytoplasm.
-Microfilaments small protein fibrils that support the cytoplasm
-Microfilaments allow muscle tissue to expland and contract.
-Intermediate filaments Protein fibrils that provide mechanical support to the cell.
Term
Cilia
Definition
-Projects from surface of cell
-Capable of moving
-Respiratory tract used to move mucus
Term
Flagella
Definition
-Like cilia but longer
-Singula flagella used for motion rather than larger amounts of cilia
Term
Microvilli
Definition
-Extensions of cell membrane
-Supported by microfilaments
-Increase surface area of the cells that have them
-Line the intestinal tract
Term
Active Transport
Definition
-Works against concentration gradient
-Molecules brought into cell by carrier molecules even though there is a higher concentration of molecules in the cell already (requires energy)
Term
Diffusion
Definition
Solute molecules move from an area of higher concentration to an area of lower concentration in solution
Term
Facilitated Diffusion
Definition
Movement is with the concentration gradient with the help of carrier molecules (glucose)
Term
Osmosis
Definition
Water going from a region of higher water concentration to one of lower concentration
Term
Hypotonic
Definition
Solution has a higher concentration of water than solutes causing the cell to swell
Term
Hypertonic
Definition
Solution has a lower concentratio of water and lower concentration of solutes than the cell causing the cell to shrink
Term
Isotonic
Definition
Solution and solute concentration is the same between the cell and the outside causing the cell to remain the same
Term
Filtration
Definition
Movement of fludis through a partition containing small holes (occurs in the kidneys)
Term
Phagocytosis
Definition
Solid particles are ingested by the cell membrane and brought into the cell (white blood cells)
Term
Pinocytosis
Definition
Liquid particles are ingested by the cell membrane and brought into the cell (epitheliall cells of the intestines)
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