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Human Body Glossary D - L
Human Body Glossary Terms D - L
149
Nursing
Professional
07/13/2010

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Cards

Term
dehydration
Definition

state in which there is a deficiency in body water

Term
dendrite
Definition

tree like process of the neuron that receives stimulus & carries it toward the cell body

Term

deoxyribonucleic acid

DNA

Definition

nucleotide that stores the genetic information of the orgamism

Term
depolarization
Definition

change in the membrane potential across the cell memberane with the inside of the cell becoming less negative or less polarized

Term
dermatome
Definition

area of the body that is supplied by a spinal nerve

Term
dermis
Definition

thick layer of dense connective tissue that lies under the epidermis of the skin

Term
detrusor muscle
Definition

smooth muscle located in the urinary bladder

Term
dialysis
Definition

a passive transport process that allows small particles to diffuse through a semipermeable membrane

Term
diaphragm
Definition

dome-shaped skeletal muscle that separates the thoracic & abdominal cavities

 

it is the cheif muscle of inspiration (inhalation)

Term
diaphysis
Definition

shaft of a long bone

Term
diastole
Definition

relaxation phase of the cardiac cycle

Term
diastolic blood pressure
Definition

blood pressure in the large arteries when the heart is resting (diastole)

 

the bottom number of the BP reading

Term
differentiation
Definition

process whereby a cell becomes specialized

Term
diffusion
Definition

passive transport process that causes movement of a substance from an area of high concentration to an area of low concentration

Term
digestion
Definition

process of breaking down food into absorbable particles

Term
disease
Definition

failure of the body to function properly

Term
diuresis
Definition

increase excretion of urine

Term
dominate gene
Definition

gene whose trait is expressed

Term
dorsal cavity
Definition

body cavity that is located toward the back part of the body

 

divided into the cranial cavity & the spinal cavity

Term
dorsal root
Definition

sensory nerve of a spinal nerve as it attatches to the spinal cord

Term
duodenum
Definition

first part of the small intestine

Term
eccrine gland
Definition

type of sweat glad that secretes a watery substance

 

plays an important role in the regulation of body temperature

Term
edema
Definition

abnormal collection of fluid, usually causing swelling

Term
efferent
Definition

movement away from a central point, such as a motor neuron that carries information away from the central nervous system (CNS)

Term
efferent neuron
Definition

a motor neuron

 

brings information from the CNS to the periphery

Term

electrocardiogram

ECG

EKG

Definition

graphic recording of the electrical events that occur during a cardiac cycle

Term
electrolyte
Definition

compound that dissociates into ions when dissolved in water

Term
electrolyte balance
Definition

having normal balance amounts of electrolytes in each fluid compartment

Term
element
Definition

substance composed of only one kind of atom

Term
embryo
Definition

the developing human between the gestational stages of 2 & 8 weeks

Term
emulsification
Definition

the physical breakdown of a large fat globule into many smaller fat globules

Term
endocardium
Definition

inner lining of the heart wall

Term
endocrine
Definition

ductless gland that secretes hormones, usually in the blood

Term
endocytosis
Definition

uptake of material through the cell membrane by forming a vesicle

 

includes pinocytosis & phagocytosis

Term
endocardium
Definition

inner mucous membrane lining of the uterus

Term

endoplasmic reticlum

ER

Definition

intracellular membrane system that is concerned with the synthesis & transportation of protein

 

called the rough "one" if ribosomes are attached

 

called the smooth "one" if there are no ribosomes

Term
energy
Definition

ability to perform work

Term
enzyme
Definition

organic catalyst

 

it speeds of the rate of a chemical reaction

Term
eosinophil
Definition

type of granular leukocyte

 

stains red

Term
epicardium
Definition

outer layer of the heart

 

forms part of the pericardium

Term
epidermis
Definition

outer epithelial layer of the skin

Term
epididymis
Definition

coiled tube that carries sperm from the testis to the vas deference

Term
epiglottis
Definition

cartilage that guards the opening into the larynx

 

directs food & water to the esophagus

Term
epiphysis
Definition

end of a long bone

Term
epithelial tissue
Definition

one of the 4 types of tissues

 

found on the surface of the body (skin) & lining the body cavities

 

it also forms glands

Term
equilibrium
Definition

balance

Term
erythrocyte
Definition

red blood cell

Term
erythropoietin
Definition

hormone secreted by the kidneys that stimulates the bone marrow to produce red blood cells

Term
esophagus
Definition

the tubelike structure that connects the pharynx to the stomach

 

the food tube

Term
estrogen
Definition

female sex hormones secreted by the developing ovarian follicle

Term
eustachian tube
Definition

tube that coonects the pharynx to the middle ear

 

also called the auditory tube

Term
evaporation
Definition

loss of heat as water changes from the liquid to the vapor or gas state

Term
exchange vessel
Definition

see capillaries

Term
exhalation
Definition

process of moving air out of the lungs

 

the breathing-out phase of ventilation

 

also called expiration

Term
exocrine gland
Definition

type of gland that secretes its products into ducts that open to a surface

Term
exocytosis
Definition

elimination of material from a cell through the formation of vesicles

Term
extension
Definition

increase in the angle of a joint

Term
extracellular fluid
Definition

fluid that is located outside of a cell, such as plasma & interstitial fluid

Term
facilitated diffusion
Definition

process by which a substance moves with the assistance of a carrier molecule from an area of high concentration to an area of low concentration

Term
fallopian tube
Definition

passage way through which the egg or zygote move from the ovary to the uterus

 

also called the oviduct or uterine tube

Term
fascia
Definition

fibrous connective tissue membrane that covers individual skeletal muscles or certain organs

Term
fertilization
Definition

union of an ovum  & a sperm to form a zygote

 

also called conception

Term
fetus
Definition

name given to the deloping human at the end of the embryonic period

 

from the end of the 8th week of pregnancy to birth

Term
fibrin
Definition

protein strands foemed by the action of thrombin on fibrinogen

 

the clot

Term
filtration
Definition

process of which water & dissolved substances move through a membrane in response to pressure

Term
flexion
Definition

decrease angle of a joint

 

a bending movement

Term
fontanel
Definition

membranous gap between carnial bones of an infant's skull

Term
frontal lobe
Definition

anterior portion of the cerebeum that controls voluntary skeletal activity & plays an important role in emotions, critical thinking, & ethical decision making

Term
frontal plane
Definition

verticle plane that divides the body into front (anterior) & back (posterior) parts

 

the coronal plane

Term
fungus
Definition

plant like organisms such as mushrooms

 

cause mycotic infections

Term
gene
Definition

part of the chromosome that codes for a specific trait

 

the biologic unity of heredity

Term
glomerular filtration
Definition

the filtration (pushing) of water & dissolved solute across the glomerular membrane

 

The rate of "this" is called the _________  _________ rate or GFR

Term
glomerulus
Definition

tuft of capillaries located within the Bowman's capsule of the nephron unity of the kidneys

Term
glottis
Definition

opening between the vocal cords

 

an air passage for the respiratory tract

Term
gluconeogenesis
Definition

biochemical process that makes glucose from nonglucose substances, especially protein

Term
glucose
Definition

a monosaccharide, or simple sugar, that serves a sthe principal fuel for the cells of the body

Term
glycogen
Definition

polysaccharide that is the storage form of gulcose

 

also called animal starch

Term
glycolysis
Definition

anaerobic catabolism of glucose into lactic acid

Term
golgi apparatus
Definition

membranous organelle that is concerned with the final trimming & packaging of protein for exocytes

Term
gonad
Definition

organ that produces gametes (ova or sperm)

 

term for ovaries & testes

Term
gonadotropin
Definition

hormone "aimed at" the gonads

 

includes follicle-stimulating hormone (FSH), luteinizing hormone (LH), & human chorionic gonadotrpin (hCG)

Term
graafian follicle
Definition

mature ovarian follicle

Term
gray matter
Definition

part of the central nervous system (CNS) that is composed of cell bodies & unmyelinated fibers

Term
haversian system
Definition

structural unit of compact bone

 

bone is layered in concentric circles around an osteonic canal

 

osteon

Term
helminth
Definition

parasitic worm

Term
hematocrit
Definition

laboratory tests that expresses the % if RBC's present in a volume of blood

Term
hematopoiesis
Definition

production of blood cells

Term
hemoglobin
Definition

iron-containing protein in the RBC that has the ability to take up & release oxygen

 

also transports CO2

Term
hemolysis
Definition

break down of erythrocytes (RBC's)

Term
hemostasis
Definition

the stopping of blood loss

Term
homeostasis
Definition

ability of the body to maintain a constant internal environment

Term
hormone
Definition

substance secreted by an endocrine gland into the blood

Term

human chorionic gonadotropin

hCG

Definition

hormone secreted by the trophoblastic cells

 

maintains the corpus luteum until the placenta can take over its grandular function

Term
hydrogen bond
Definition

weak intermolecular bond formed between hydrogen & a negatively charged atom such as oxygen or nitrogen

Term
hyperkalemia
Definition

abnormally high potassium level

Term

hypertension

HTN

Definition

BP that is higher than normal

Term
hypertonic
Definition

having a solute concentration greater than a reference solution

Term
hypertrophy
Definition

increase in the size of a body part, usually refering to a muscle

Term
hyperventilation
Definition

abnormally rapid, deep breathing

Term
hypokalemia
Definition

a lower than normal amount of potassium in the blood

Term
hypophysis
Definition

pituitary gland

Term
hypotension
Definition

BP that is lower than normal

Term
hypothalamus
Definition

part of the diencephalon (below the thalamus) that regulates the pituitary gland, the autonomic nervous system (ANS), water balance, appetite, temperature, & the emotions

Term
hypotonic
Definition

having a solute concentration less than a reference solution

Term
hypoventilation
Definition

abnormally slow & or shallow respiratory rate

Term
ileum
Definition

distal end of the small intestine

Term
immunity
Definition

ability to resist & overcome injury by pathogens or antigenic substances

Term
immunoglobulin
Definition

antibodies produced by plasma cells in response to antigenic stimulation

Term
infection
Definition

disease caused by a pathogen

Term
inflammation
Definition

body's response to infection or injury

 

characterized by redness, heat, sweeling, & pain

Term
inhalation
Definition

process of moving air into the lungs

 

the breathing-in phase of ventilation

 

also called inspiration

Term
inotropic effect
Definition

a change in the strength or force of myocardial contraction that does not involve stretching the myocardial fibers

Term
insertion
Definition

the moveable attachment pointof a muscle to a bone

Term
intake
Definition

amount of fluid taken into the body

Term
integumentary system
Definition

organ system that consists of the skin & the accessory organs

Term
intercellular
Definition

between the cells

Term
interferons
Definition

substances produced by a virus-infected cell

 

the substance protects other cells from viral infection

Term
interneurons
Definition

an association neuron

 

links the sensory & motor neurons in the central nervous system (CNS)

Term
interstitual fluid
Definition

fluid located between the cells

 

tissue fluid

Term
intracellular fluid
Definition

fluid located within the cells

Term
intrapleural pressure
Definition

the pressure within the intrapleural space

 

must be negative in order for the lungs to be expanded

Term
ion
Definition

an electrically charged atom or groups of atoms

 

either cations or anions

Term
ionic
Definition

bond formed bythe exchange of electrons between atoms

Term
ischemia
Definition
insufficient blood flow to a tissue, sometimes resulting in tissue damage & death
Term
isotonic
Definition

having the same concentration as the reference solution

Term
isotope
Definition

elements that have the same # of protons & electrons but a different # of neutrons

Term
jaundice
Definition

yellow coloring of the skin & "whites" of the eyes caused by an increase of bilirubin in the blood

Term
jejunum
Definition

second or middle part of the small intestine

Term
joint
Definition

union of two or more bones

 

an articulation

Term
karyotype
Definition

arrangement of the chromosomes by pairs in a fixed order

Term
keratin
Definition

a protein found in the skin, hair, & nails

 

it hardens the cell & makes them water-resistent

Term
ketone bodies
Definition

products of faulty fatty acid catabolism

 

includes acetone, acetoacetic acid, & beta hydroxybutyric acid

Term
kidney
Definition

organ of the urinary system that produces urine

Term
kussmaul respirations
Definition

increase the rate & depth of respirations in order to correct a metabolic acidosis

Term
lacrimal gland
Definition

gland that secretes tears

Term
lacteal
Definition

lymph vessel in a villus of the small intestine

Term
larynx
Definition

structure that contains the vocal cords

 

voice box

Term
leukocyte
Definition

white blood cell (WBC)

 

it functions primarily to defend the body against infection

Term
ligament
Definition

strong band of coonective tissue that joins bone to bone

Term
limbic system
Definition

the emotional brain

Term
lipase
Definition

enzyme that digests fats into fatty acids & glycerol

Term
lipid
Definition

organic molecule that includes fats, oils, & steroids

Term
loop of henie
Definition

a hairpin looped tubular structure of the nephron unit that receives urine from the proximal tuble & delivers it to the distal tubule

Term
lymph
Definition

fluid that has the same composition as tissue fluid & is carried by the lymph vessels

Term
lymph node
Definition

mass of lymphoid tissue located along the course of a lymphatic vessel

Term
lymphatic duct
Definition

large tube or vessel that carries lymph, such as the thoracic duct

 

same as lymphatic vessel

Term
lymphatic vessels
Definition

the tubes through which lymph flows

Term
lymphocyte
Definition

a granular leukocyte

 

There are T & B "ones"

Term
lysosomes
Definition

organelle that contains powerful enzymes

 

engages in phagocytosis & does the "intracellular housecleaning"

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