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A & P

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Question
Answer
Homeostasis   the relatively constant states maintained by the body  
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Integumentary   separates internal environment from external environment, providing stability of internal fluid volume  
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Skeletal   supports and protects internal environment, allowing movement; stores minerals that can be moved into and out of internal fluid  
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Muscular   powers and directs movements; provides heat  
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Nervous   regulates homeostatic mechanisms, sensing changes, integrating information, sending signals to effectors  
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Endocrine   regulates homeostasis by secreting signaling hormones that travel through internal environment to effector cells  
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Cardiovascular   maintains internal constancy by transporting nutrients, water, oxygen, hormones, wastes, and other materials and heat within the internal environment  
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Lymphatic   maintains constant fluid pressure by draining excess fluid from tissues, cleaning it, and recycling it to bloodstream  
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Immune   defends internal environment against harmful agents  
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Respiratory   maintains stable O2 and CO2 levels in body by exchanging these gases between external and internal environments; provides vocal communication with others for protection, hunting, etc.  
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Digestive   maintains relatively constant nutrient level in body by digesting food and absorbing nutrients into internal environment  
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Urinary   maintains constantly low level of waste and regulates pH of internal environment; helps maintain constancy of internal water volume and balance of ions and other substances  
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Reproductive   passes genetic code containing information for forming a body and maintaining homeostasis to offspring  
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There is a minimum of four basic components in every feedback control loop   1. Sensor mechanism 2. Integrator or control center 3. Effector mechanism 4. Feedback  
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Sensor   any agent or mechanism that detects a change in conditions (or stimulus) inside or outside the body, such as a sensory receptor  
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Integrator   an integration center or control center that receives sensed information and compares that to stored or setpoint information, possibly sending a response to an effector that will act to change the value of the sensed information  
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Effectors   organ, gland, or muscle that responds to a regulatory control signal, such as a nerve stimulus or hormone  
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Negative feedback   feedback control system in which the level of a variable is changed in the direction opposite to that of the initial stimulus  
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Positive feedback   feedback control system that is stimulatory; tends to amplify or reinforce a change in the internal environment  
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Feed-forward   concept that information may flow ahead to another process to trigger a change in anticipation of an event that will follow  
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Intracellular control   level of homeostatic control of body processes that occurs within cells, as in genetic regulation or enzymatic regulation of the cell  
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Intrinsic control   level of homeostatic control of body processes that occurs within a particular tissue or organ, as when local regulators such as prostaglandins regulate local physiology  
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Extrinsic control   style of physiological regulation in which the control center (regulatory center) is outside, or extrinsic to, the tissue being regulated; for example, the brain’s control of a leg muscle or the pituitary gland’s regulation of the thyroid gland  
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Epidemiology   study of the occurrence, distribution, and transmission of diseases in human populations  
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Idiopathic   refers to a disease of undetermined cause  
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Prions   short for “proteinaceous infectious particles,” which are proteins that convert proteins of the cell into different proteins and the altered form of the protein may then be inherited; may act as a pathogen, forming abnormal protein tangles in brain cells  
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Ions   ions can be positively or negaitively charged and that ions with opposite charges are attracted to each other  
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Signal transduction   process of changing a signal such as a hormone or neurotransmitter into another form such as enzymatic reaction within the cell receiving the signal  
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Hydrogen bonds   hydrogen bonds are much weaker forces than ionic or covalent bonds they require less energy to break. hydrogen bonds result from unequal charge distribution on a molecule  
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Chromatin   threadlike form of DNA, making up the genetic material in the nucleus  
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Microfilaments   smallest cell fibers  
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Three basic types of chemical reactions   1. Synthesis reactions 2. Decomposition reactions 3. Exchange reaction  
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Synthesis reactions   chemical reaction that combines two or more reactants to form a more complex structure  
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Exchange reactions   chemical reaction that breaks down a compound and then synthesizes a new compound by switching portions of the molecules  
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Intermediate filaments   twisted strands of protein, slightly larger than microfilaments that make up part of the cell’s internal skeleton  
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Rough endoplasmic reticulum (RER)   is made up of broad, flattened sacs that extend outward from the boundary of the nucleus  
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Dehydration synthesis   anabolic process by which molecules are joined to form larger molecules; often called condensation reaction because it joins molecules together into a denser mass  
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Buffers   compound that combines with an acid or with a base to form a weaker acid or base, thereby lessening the change in hydrogen ion concentration that would occur without the buffer; often operates as buffer pairs  
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Smooth endoplasmic reticulum (SER)   No ribosomes border the membranous wall; part of the network is usually more tubular in structure than the flattened sacs of the RER  
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Endoderm   innermost layer of the primary germ layers that develops early in the first trimester of pregnancy; gives rise to digestive and urinary structures, as well as many other glands and organ parts  
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Mesoderm   middle layer of the primary germ layers; gives rise to such structures as muscle, bones, and blood vessels  
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Ectoderm   outermost of the primary germ layers that develops early in the first trimester of pregnancy; gives rise to the skin and the nervous system  
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Proteins   large molecules formed by linkage of amino acids by peptide bonds; one of the basic building blocks of the body  
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Glycoproteins   substance made of molecules that are a combined form of carbohydrate and protein  
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Proteoglycans   large molecule made up of a protein strand that forms a backbone to which are attached many carbohydrate molecules  
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Polysaccharides   complex sugar or starch, such as glycogen and plant starches; made up of many monosaccharides  
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Three types of exocrine glands may be identified   1. Apocrine 2. Holocrine 3. Merocrine  
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Stratum basal   “base layer”; deepest layer of the epidermis; cells in this layer are able to reproduce themselves  
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Friction ridges   raised underlying dermal papillae; form fingerprints  
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Stratum spinosum   “spiny layer”; layer of epidermis that is rich in RNA to aid in protein synthesis required for keratin production  
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Stratum granulosum   “granular layer”; layer in which the process of keratinization begins  
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Stratum lucidum   “clear” layer of the epidermis, in thick skin between the stratum granulosum and the stratum corneum  
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Stratum corneum   tough outer layer of the epidermis; cells are filled with keratin  
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Eumelanin   type of melanin pigment that is dark brown in color  
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Pheomelanin   type of melanin pigment that is reddish in color  
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Diaphysis   shaft of a long bone  
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Epiphyses   end of a long bone; also, the pineal body of the brain  
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Articular cartilage   either of a pair of cartilages found in the supporting framework of the larynx  
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Periosteum   tough, connective tissue covering the bone  
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Medullary cavity   hollow area inside the diaphysis of the bone that contains yellow marrow  
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Interstitial growth   cartilage growth following mitosis and secre-tion of matrix by chondrocytes; interstitial growth of epiphyseal plate results in growth in length of long bones  
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Appositional growth   process by which a flat bone or cartilage grows in size by addition of bony cartilage at its surface  
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Endochondral ossification   process by which bones are formed by replacement of cartilage models  
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Intramembranous ossification   process by which most flat bones are formed within connective tissue membranes  
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Ossification centers   bone formation centers  
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Primary ossification center   where a blood vessel enters the cartilage of a developing bone at the midpoint of the diaphysis to initiate bone formation  
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Secondary ossification centers   growth center located in the epiphyses of long bones  
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Metaphysis   hollow area inside the diaphysis of the bone that contains yellow marrow  
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Synarthroses   joint in which fibrous connective tissue joins bones and holds them together tightly; commonly called sutures  
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Amphiarthroses   slightly movable joint such as the one that connects the two pubic bones  
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Diarthroses   freely movable joint  
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Gomphoses   fibrous joint where a process is inserted into a socket; for example, the joint between the tooth and mandible  
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Syndesmoses   fibrous joint  
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Synchondroses   joint characterized by the presence of hyaline cartilage between articulating bones  
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Biaxial joints   skeletal articulation that has two axes of movement  
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Multiaxial joints   joint that permits movement around three or more axes and in three or more planes  
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Radioulnar joints   articulation of the head of the radius and the radial notch of the ulna  
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Radiocarpal joints   the point of articulation where the radius distally articulates directly with the carpal bones  
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Intercarpal joints   articulation between the eight carpal bones  
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Carpometacarpal joints   skeletal articulation between a wrist (carpal) bone and hand (metacarpal) bone  
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Interphalangeal joints   articulation that exists between the heads of the phalanges and the bases of the more distal phalanges  
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Prepatellar bursitis   inflammation of the prepatellar bursa; also called “housemaid’s knee”  
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Satellite cells   a type of Schwann cell (neuroglial cell) that sur-rounds the cell bodies of neurons of the peripheral nervous system  
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Isotonic contraction   type of muscle contraction in which the muscle sustains the same tension or pressure and a change in the distance between two bones occurs  
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Isometric contraction   level of homeostatic control of body processes that occurs within cells, as in genetic regulation or enzymatic regulation of the cell  
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