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A&P 9th edition Ch 1-3
Chapter 1-3 of Human Anatomy & Physiology 9th edition
126
Medical
Undergraduate 1
09/25/2014

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Term
Homeostasis
Definition
A state of body equilibrium or stable internal environment of the body
Term
Superior (Cranial)
Definition
Toward the head end or upper part of s structure or the body; Above (The head is superior to the abdomen)
Term
Inferior (Caudal)
Definition
Away from the head end or toward the lower structure or the body; Below (The navel is inferior to the chin)
Term
Ventral (Anterior)
Definition
Toward or at the front of the body; In front of (The breastbone is anterior to the spine)
Term
Dorsal (Posterior)
Definition
Toward or at the back of the body; Behind (The heart is posterior to the breastbone)
Term
Medial
Definition
Toward or at the midline of the body; on the inner side of (The heart is medial to the arm)
Term
Lateral
Definition
Away from the midline of the body; On the outer side of (The arms are lateral to the chest)
Term
Intermediate
Definition
Between a more medial and a more lateral structure (The collarbone is intermediate between the breast bone and shoulder)
Term
Proximal
Definition
Close to the origin of the body part or the point of attachment of a limb to the body trunk (The elbow is proximal to the wrist)
Term
Distal
Definition
Farther from the origin of the body part or the point of attachment of a limb to the body trunk (the knee is distal to the thigh)
Term
Superficial (External)
Definition
Toward or at the body surface (The skin is superficial to the skeletal muscles)
Term
Deep (Internal)
Definition
Away from the body surface; more internal (The lungs are deep to the skin)
Term
Matter
Definition
The stuff of the universe. Solid , Liquid and Gaseous Sates
Term
Energy
Definition
The capacity to do work, or to put matter into motion.
Term
Kinetic Energy
Definition
Energy in action
Term
Potential Energy
Definition
Stored energy, that is, inactive energy that has the potential, or capability, to do work but is not presently doing so
Term
Chemical Energy
Definition
The form stored in the bonds of chemical substances.
Term
Electrical Energy
Definition
Results from the movement of charged particles
Term
Mechanical Energy
Definition
Energy directly involved in moving matter
Term
Radiant energy, or Electromagnetic Energy
Definition
Energy that moves in waves
Term
Protons
Definition
Subatomic particle that bears a positive change; Located in the atomic nucleus
Term
Electron
Definition
Negatively charged subatomic particle; Orbits the atom's nucleus
Term
Atomic Number
Definition
The number of protons in an atom
Term
Atomic Mass (Mass Number)
Definition
Sum of the masses of all an atoms protons and neutrons
Term
Isotope
Definition
Different atomic forms of the same element, which vary only in the number of neutrons they contain; The heavier species tend to be radioactive
Term
Compound
Definition
Substance composed of two or more different elements, The atoms of which are chemically united
Term
Solution
Definition
Homogeneous mixtures of components that may be gases, liquids, or solids. Exact same compilation throughout (Mineral Water)
Term
Colloid (Emulsion)
Definition
Heterogeneous mixtures, which means that their composition is dissimilar in different areas of the mixture (Jello)
Term
Suspension
Definition
Heterogeneous mixtures with large, often visible solutes that tend to settle out (Blood)
Term
pH Scale
Definition
The measure of acidity or alkalinity, measures hydrogen ions
Term
Acid
Definition
A substance that releases hydrogen ions when in solutes; A proton donor
Term
Base
Definition
A substance capable of binding with hydrogen ions; Proton acceptor
Term
Liquid Water is Composed of?
Definition
H+, OH- and H2O
Term
Organic Compounds
Definition
Any compound composed of atoms (some of which are carbon) held together by covalent bonds
Term
Carbohydrates
Definition
Organic compound composed of carbon, hydrogen and oxygen; Includes starches, sugars and cellulose
Term
Lipids
Definition
Organic compound composed of carbon, hydrogen and oxygen; Examples fats and cholesterol
Term
Proteins
Definition
Organic compound composed of carbon, oxygen, hydrogen and nitrogen; Types include enzymes, structural components, 10-30% of cell mass
Term
Nucleic Acids
Definition
Class of organic molecules that include DNA and RNA
Term
Molecule
Definition
Particle consisting of two or more atoms joined together by chemical bonds
Term
Viruses
Definition
Don’t have a cell membrane, they steal ours; They are a string of DNA that can only reproduce in us
Term
What Does A Human Body Need?
Definition
Nutrients, Water, Oxygen, Warmth, Pressure and Acidity/Alkalinity
Term
Negative Feedback
Definition
Triggers receptors, when they reach optimum level triggers effectors
Term
Positive Feedback
Definition
More you have, More you get; Example Labor
Term
Chemical Bonds
Definition
An energy relationship holding atoms together; Involves the interaction of electrons
Term
Ionic Bonds
Definition
Chemical bond formed by electron transfer between atoms
Term
Covalent Bonds
Definition
Chemical bond formed by electron sharing between atoms
Term
Hydrogen Bonds
Definition
Weak bond in which hydrogen atom forms a bridge between two electron-hungry atoms
Term
Receptor
Definition
A cell or nerve ending of a sensory neuron specialized to respond to particular types of stimuli
Term
Effector
Definition
Organ, gland, or muscle capable of being activated by nerve endings
Term
Diffusion
Definition
No energy required; Picks up High concentration drops off low concentration; Example Oxygen on blood
Term
Osmosis
Definition
Diffusion of a solvent through a membrane from a dilute solution into a more concentrated one
Term
Tonicity
Definition
A measure of the ability of a solution to cause a change in a cell shape or tone by promoting osmotic flows of water
Term
Hypertonic Solution
Definition
A solution that has higher concentration of non-penetrating solutes than the reference cell
Term
Hypotonic Solution
Definition
A solution that is more dilute that the reference cell
Term
Isotonic Solution
Definition
A solution with the same composition of a cell; Not too much salt or too much water for example
Term
Plasma Membranes
Definition
Membrane, composed of phospholipids, cholesterol, and protein, that encloses the cell contents; Outer limiting cell membrane
Term
Glycocalyx
Definition
A layer of externally facing glycol-proteins on a cell’s plasma membrane
Term
Most Common Things to Go Across the Membrane
Definition
K+, Na+ and Ca+
Term
Facilitated Diffusion
Definition
Diffusing a substance attached to a lipid-soluble membrane carrier protein
Term
Filtering (Passive)
Definition
Kidneys
Term
Active Transport
Definition
Membrane transport process for which ATP is required; Example solute pumps
Term
Charged Particles Move Across Cells With?
Definition
Na+ and K+
Term
Transmembrane Potential
Definition
The charge between the inside and outside of a cell with more – on the inside and more + on the outside
Term
Vesicular Transport
Definition
Transport of large particles and macromolecules into or out of a cell between its compartments in membrane-bound sacs
Term
Phagocytosis
Definition
Engulfing of foreign solids by cells
Term
Pinocytosis
Definition
Engulfing of extracellular fluid by cells
Term
Cytoplasm (Cytosol)
Definition
The cellular material surrounding the nucleus and enclosed by the plasma membrane; Mostly protein, sugar and water
Term
Cytoskeleton
Definition
Network of rods; Moves things around in the cell
Term
Centrioles
Definition
Minute body found near the nucleus of a cell; Active in cell division
Term
Centrosomes
Definition
A region near the nucleus which contains paired organelles called centrioles
Term
Monosaccharides
Definition
Simple sugar (One Sugar); Building blocks of carbohydrates
Term
Disaccharides
Definition
Double sugar; Example Sucrose and Lactose
Term
Polysaccharides
Definition
Polymer of linked monosaccharides
Term
Triglycerides (Neutral Fats)
Definition
Fats and oils composed of fatty acids and glycerol; Are body’s most concentrated source of energy
Term
Phospholipids
Definition
Modified lipid; Contains phosphorus
Term
Steroids
Definition
A group of chemical substances including certain hormones and cholesterol; They are fat soluble and contain little oxygen
Term
Eicosanoids
Definition
Diverse lipids chiefly derived from 20-carbon fatty acid found in all cell membranes
Term
Amino Acids
Definition
Organic compound containing nitrogen, carbon, hydrogen, and oxygen; Building blocks of proteins
Term
Peptide Bonds
Definition
Bond joining the amine group of one amino acid to the acid carboxyl group of a second amino acid with the loss of a water molecule
Term
Enzymes
Definition
A protein that acts as a biological catalyst to speed up a chemical reaction
Term
Molecular Chaperones
Definition
Help proteins to achieve their functional three-dimensional structure
Term
Fibrous Proteins
Definition
Extended and strand like proteins; Example collagen, keratin, elastin, spectrin, titin, and actin
Term
Globular Proteins
Definition
Compact, spherical proteins that have at least tertiary structure; Example enzymes, hemoglobin, antibodies, ect
Term
DNA
Definition
Deoxyribonucleic Acid; Holds all the organisms hereditary information
Term
RNA
Definition
Ribonucleic Acid; Carries out DNA’s instructions for protein synthesis
Term
ATP
Definition
Adenosine Triphosphate; Organic molecule that stores and releases chemical energy for use in the body’s cells
Term
Transport Work
Definition
ATP phosphorylates transport proteins, activating them to transport solutes (ions, for example) across cell membranes
Term
Mechanical Work
Definition
ATP phosphorylates contractile proteins in muscle cells so the cells can shorten
Term
Chemical Work
Definition
ATP phosphorylates key reactants, providing energy to drive energy-absorbing chemical reactions
Term
Mitochondria
Definition
Where ATP is made and energy stored; Needs O2; Have their own DNA
Term
Nucleus
Definition
Control center of a cell; Contains genetic material
Term
Ribosomes
Definition
Cytoplasmic organelles at which proteins are synthesized
Term
Golgi Apparatus
Definition
Membrane system close to the nucleus that packages, modifies and segregates proteins
Term
Lysosomes
Definition
Sac containing acid hydrolases; Intracellular digestion; Suicide sacs
Term
Peroxisomes
Definition
Membrane sacs of catalase and oxidase enzymes; Breaks down hydrogen peroxide; Destroys free radicles
Term
Smooth Endoplasmic Reticulum
Definition
Membranous system of sacs and tubules; Site of lipid and steroid synthesis, lipid metabolism, and drug detoxification
Term
Rough Endoplasmic Reticulum
Definition
Membranous system enclosing a cavity; Externally studded with ribosomes; External face synthesizes phospholipids
Term
Tight Junctions
Definition
A series of integral protein molecules in the plasma membrane of adjacent cells fuse together, forming an impermeable junction that encircles the cell
Term
Desmosomes
Definition
Anchoring Junctions- Mechanical couplings scattered like rivets along the sides of abutting cells to prevent their separation
Term
Gap Junctions (Nexus)
Definition
A communicating junction between adjacent cells
Term
Primary Active Transport
Definition
A type of transport in which the energy needed to drive the transport process is provided directly by hydrolysis of ATP
Term
Secondary Active Transport
Definition
A single ATP-powered pump; Such as Na+ or K+
Term
Endocytosis
Definition
Means by which a fairly large extracellular molecules or particles enter cells
Term
Exocytosis
Definition
Mechanism by which substances are moved from the cell interior to the extracellular space as a secretory vesicle fuses with a plasma membrane
Term
Membrane Potential
Definition
Voltage across the plasma membrane
Term
Resting Membrane Potential
Definition
The voltage that exists across the plasma membrane during the resting state of an excitable cell
Term
Cell Adhesion Molecules (CAMs)
Definition
Found on almost every cell in the body; Play key roles in embryonic development and wound repair, and in immunity
Term
Ligands
Definition
Chemicals that bind specifically to plasma membrane receptors; Include most Neurotransmitters, Hormones, and Paracrines
Term
Microfilaments
Definition
Strands made of spherical proteins subunits called actins
Term
Intermediate Filaments
Definition
Tough, Insoluble protein fibers constructed like woven ropes composed of tetramer (4) fibrils
Term
Microtubules
Definition
Hollow tubes of spherical protein subunits called tubulins
Term
Cillia
Definition
Tiny, hair-like projections on a cell surface that move in a wavelike manner
Term
Flagellum
Definition
Long, whip-like cellular extensions containing microtubules; Propels sperm and some single-celled eukaryotes
Term
Microvilli
Definition
Tiny projection on the free surface of some epithelial cells; Increase surface area for absorption
Term
Mitosis
Definition
The division of the nucleus
Term
Cytokinesis
Definition
The division of the cytoplasm
Term
Interphase
Definition
First step in cell division
Term
Prophase
Definition
First phase of mitosis
Term
Metaphase
Definition
Lines up chromosomes at the center
Term
Telophase
Definition
The two cells start to stich into two separate cells; Prophase in reverse
Term
Messenger RNA (mRNA)
Definition
Relatively long nucleotide strands resembling “half-DNA” molecules; Carries a transcript of the code to the cytoplasm, Where protein synthesis occurs
Term
Ribosomal RNA (rRNA)
Definition
Along with protein, form the ribosomes, which consist of two subunits- one large and one small; The two subunit types combine to form functional ribosomes, which are the site of protein synthesis
Term
Transfer RNA (tRNA)
Definition
Small, roughly L-shaped molecules that ferry amino acids to the ribosomes. There they decode the mRNA’s message for amino acid sequence in the polypeptide to be built
Term
4 Nucleic Acids That Make Up DNA
Definition
TACG
Term
4 Nucleic Acids That Make Up RNA
Definition
AUGC
Term
Anaphase
Definition
Move pairs of chromosomes to opposite ends
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