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Human Body Glossary M - R
Human Body Glossary M - R
144
Nursing
Professional
07/16/2010

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Cards

Term
macrophage
Definition

enlarged monocyte that eats foreign material

 

a "big-eater"

Term
mammary gland
Definition

gland of the female breast that secretes milk

Term
matter
Definition

anything that occupies space

 

may occur as solid, liquid, or gas

Term
mechanoreceptor
Definition

receptor that is stimulated by bending, pressing, or pushing

Term
mediastinum
Definition

space between the lungs that containsthe heart, trachea, thymus gland, esophagus, & large blood vessels

Term
medulla oblongata
Definition

part of the brain stem that controls vital functions such as respiratory & cardiovascular function

Term
meiosis
Definition

type of cell division used by the sex cells to reduce the # of chromosomes in each from 46 to 23

Term
melanin
Definition

pigment that is responsible for the color of the skin & hair

Term
melanocyte
Definition

melanin-producing cell

Term
meninges
Definition

membranes that cover the brain & spinal cord & include the dura mater, arachnoid mater, & pia mater

Term
menopause
Definition

normal developmental stage in women that marks the end of the ovarian & uterine cycles

Term
menses
Definition

menstruation

 

the monthly discharge of blood from the uterus

Term
metabolic acidosis
Definition

a condition in which pH decreases below 7.35

 

the cause is nonrespiratory

Term
metabolic alkalosis
Definition

a condition in which pH increases above 7.45

 

the cause is nonrespiratory

Term
metabolism
Definition

all the chemical reactions that occur within the cells

 

consists of anabolism & catabolism

Term
micturition
Definition

urination

Term
milk let-down reflex
Definition

an oxytocin-mediated reflex that results in the release of milk from the breast in response to suckling

Term
mineral
Definition

inorganic substance such as sodium or potassium

Term
mitochondria
Definition

organelles that produce most of the ATP

 

the "powerplants" of the cell

Term
mitosis
Definition

type of cell division that produces 2 identical daughter cells, each containing 46 chromosomes

Term
mitral valve
Definition

bicuspid valve

Term
mixed nerve
Definition

nerve that contains both sensory & motor fibers

Term
mixture
Definition

combination of 2 two or more substances that can be separated by ordinary physical means

Term
molecule
Definition

chemical combination of 2 or more atoms

Term
monocyte
Definition

agranular phagocytic leukocyte that can become a macrophage

Term
monosaccharide
Definition

a simple sugar consisting of hexoses (glucose, fructose, galactose) or pentoses (ribose, deoxyibose)

Term
morphology
Definition

structure of the body

Term
motor nerve
Definition

collection of motor neurons that carries information away from the central nervous system (CNS)

Term
mucous membrane
Definition

type of membrane that lines the cavities & tubes that open to the exterior of the body

Term
muscarinic receptor
Definition

cholinergic receptor that is activated by acetylcholine

 

located primarily on the target organs of the parasympathetic nerves

Term
muscle tissue
Definition

type of tissue that contains the contractile proteins, actin & myosin

 

3 types of muscles are: smooth, skeletal, & cardiac

Term
myelin
Definition

white, fatty material that covers some nerve fibers

Term
myocardium
Definition

heart muscle

Term
myometrium
Definition

muscle layer of the uterus that contracts & causes the dilivery of the infant

Term
myosin
Definition

muscle protein that interacts with actin to cause muscle contraction

 

also called the thick filament

Term
naturally acquired immunity
Definition

immunity that is acquired through natural means, such as getting a disease or receiving antibodies from your mother

Term
negative feedback
Definition

a mechanism that is activated by an imbalance

 

activation of the mechanism then corrects the imbalance

Term
nephron unit
Definition

structural & functional unit of the kidney that make urine

Term
nerve
Definition

bundle of nerve fibers & blood vessels

Term
nerve impulse
Definition

action potential that occurs in neurons

Term
nerve tract
Definition

group of neurons that share a common function within the central nervous system (CNS)

 

may be assending (sensory) or descending (motor)

Term
nervous tissue
Definition

a type of tissue that includes neurons & neuroglia

Term
neuroglia
Definition

nerve cells that support, protect, & nurish the neurons

Term
neurohypophysis
Definition

the posterior pituitary gland

 

secrets oxytocin & antidiuretic hormone

Term
neuromusclular junction
Definition

junction or space that occurs between a motor neuron & a muscle fiber

Term
neuron
Definition

nerve cell that conducts the action potential (nerve impulse)

Term
neurotransmitters
Definition

chemical made within the axon terminal that is responsible for transmission of the signal across the synapse or junction

Term
neutrophil
Definition

granular, motile, & highly phagocytic leukocyte

Term
nicotinic receptor
Definition

a type of cholinergic receptor that is activated by a acetylcholine

 

located in the autonomic ganglia & within the neuromuscular junction

Term
nociceptor
Definition

pain receptor

Term
norepinephrine
Definition

a neutotransmitter secreted by the adrenergic fibers of the sympatetic nervous system

 

activates adrenergic receptors

Term
normal flora
Definition

a population of microoganisms that normally inhabit an area such as the skin, intestines, or vagina

Term
nosocomial infection
Definition

hospital-acquired infection

Term

nucleus

nuclei (plural)

Definition

large organelle separated from the cytoplasm by a neuclear membrane

 

stores the DNA in chromosomes & acts as the control center of the cell

Term
occipital lobe
Definition

cerebral lobe located in the back of the head

 

concerned primarily with vision

Term
olfactory receptor
Definition

chemoreceptor associated with the sense of smell

Term
oliguria
Definition

scanty urine formation

Term
oncotic pressure
Definition

the part of the osmotic pressure of the blood that is due to the plasma proteins

Term
optic chiasm
Definition

site for the crossing of the medial fibers of the optic nerve to the opposite side of the brain

 

located in front of the pituitary gland

Term
organ
Definition

group of tissues that performs a specialized function, such as the lungs

Term
organelle
Definition

part of the cell that performs a specialized function, such as the energy-producing mitochondrion

Term
organic compound
Definition

carbon-containing substance

Term
organ of corti
Definition

hearing receptors (mechanoreceptors) located in the inner ear

Term
origin
Definition

part of the muscle that is attached to the more immovable structure

Term
osmosis
Definition

movement of water across a membrane from an area where there is more water to an area where there is less water

Term
osseous
Definition

bone tissue

Term
ossicles
Definition

tiny bones found in the middle ear

Term
osteoblast
Definition

bone-building cell

Term
osteoclast
Definition

cell that cause the breakdown of bone

Term
output
Definition

amount of fluid that is eliminated from the body

Term
ovarian follicle
Definition

ovarian structure that releases an egg at maturation

 

graafian follicle

Term
ovulation
Definition

discharge of the mature ovum from the graafian follicle

Term
oxyhemoglobim
Definition

hemoglobin that contains oxygen

Term
pain receptor
Definition

nociceptor

 

free nerve endings that sense pain

Term
pancreas
Definition

organ that has both endocrine & exocrine functions

 

The islets of Langerhans secrete the hormones insulin & glucagon.

 

The exocrine glands secrete the most important of the digestive enzymes.

Term
parasite
Definition

an organism that requires another living organism for its growth & survival

Term
parasympathetic nervous system
Definition

division of the autonomic nervous system that is concerned with "feeding & breeding"

Term
parathyroid gland
Definition

gland that secretes parathyroid hormone (PTH) & helps regulate calcium balance

Term
parietal lobe
Definition

lobe of the cerebrum that is concerned primarily with somatosensory function

Term
partial pressure
Definition

pressure exerted by one gas in a gas mixture

Term
passive immunity
Definition

short-acting immunity achieved when the person is given antibodies made by another animal

Term
passive transport
Definition

transport process that requires no additional energy in the form of ATP

Term
pathogen
Definition

disease-causing organism

Term
pectoral girdle
Definition

portion of the skeleton that supports & attaches to the upper extremities

Term
peptide bond
Definition

bond formed between 2 amino acids

Term
pericardium
Definition

slinglike serous membrane that partialy encloses the heart

 

supports the weight of the heart

Term
perineum
Definition

pelvic floor

 

extends from the anus to the vulva in the female & from the anus to the scrotum in the male

Term
periosteum
Definition

fibrous connective tissue that covers the surface of a long bone

Term
peripheral nervous system
Definition

nerves & ganglia that lie outside the central nervous system

Term
peristalsis
Definition

rhythmic contraction of smooth muscle that propels a substance forward

 

"this" in the digestive tract moves food from the esophagus toward the anus

Term
peritoneum
Definition

serous membrane located in the abdominal cavity

 

there is a parietalperitoneum & a visceral peritoneum

Term
pH
Definition

a measure of the hydrogen ion concentration

Term
phagocytosis
Definition

eating of pathogens or cellular debris

Term
pharynx
Definition

the throat

Term
photoreceptor
Definition

receptor stimulated by light

 

includes the rods & cones of the retina

Term
physiology
Definition

study of the funtioning of the body

Term
pineal gland
Definition

small gland located in the brain

 

secretes melatonin & is involved in regulating biorhythms

Term
placenta
Definition

a gland & site of exchange of nutrients, oxygen, & waste between mom & baby-to-be

Term
plasma
Definition

the yellow liquid portion of blood

Term
platelet
Definition

a fragment of a megakaryocyte that functions in hemostasis

 

also called thrombocyte

Term
preload
Definition

the degree of ventricular myocardial stretch

 

end diastolic volume

Term
pleura
Definition

serous membrane located in the thoracic cavity

 

there is a visceral "one" & a parietal "one"

Term
plexus
Definition

network of nerves such as the cervical plexus

Term
polysaccharide
Definition

carbohydrate made of more than 2 simple sugars, such as glycogen

Term
precordium
Definition

area of the anterior chest that overlies the heart

Term
preganglionic fiber
Definition

a neuron that transmits action potentials from the central nervous system to a ganglion

Term
postganglionic fiber
Definition

a neuron that transmits action potentials from a ganglion to a distal target organ

Term
prime mover
Definition

the muscle that is most responsible for a particular movement

Term
progesterone
Definition

hormone secreted by the corpus luteum of the ovary

 

it stimulates the growth of the endometrium & helps maintain the pregnancy

Term
projection
Definition

process by which the brain causes a sensation to be felt at the point of stimulation

Term
proprioception
Definition

senseation of movement & position of the body

Term
prostaglandins
Definition

group of compounds that are made from fatty acids in cell membranes

 

they exert powerful hormonelike effects

Term
prostate gland
Definition

gland that surrounds the upper portion of the urethra in the male & contributes to the formation of semen

Term
protease
Definition

enzyme that digests protein

Term
protein
Definition

large, nitrogen-containing molecule that is composed of many amino acids

Term
protozoa
Definition

single-cell, animal-like microbe, classified as amebas, ciliates, flagellates, & sporozoa

Term
pulmonary circulation
Definition

path of blood through vessels that take unoxygenated blood from the right ventricle to the lungs & oxygenated blood from the lungs to the left atrium

Term
pulmonary edema
Definition

abnormal collection of fluid in the lungs causing difficulty in oxygenation of hemoglobin

Term
pulse
Definition

vibration of the arteries caused by rhythmic expansion & recoil of the large arteries following contraction of the ventricles

Term
purkinje fibers
Definition

fast-conducting fibers located in the ventricular walls

 

conduct the electrical impulses from the Bundle of His to the ventricular myocardium

Term
pyramidal tract
Definition

major motor tract that descends from the precentral gyrus of the frontal lobe to the spinal cord

 

also called the corticospinal tract

Term
radiation
Definition

loss of heat as it leaves a warm object, such as the body, to the surrounding air

Term
receptor
Definition

sensory structure that responds to specific stimuli such as light, chemicals, or touch

Term
recessive gene
Definition

gene whose trait is not expressed

Term
recruitment
Definition

enlistment of additional muscle fibers to increase the force of muscle contration

Term

red blood cell

RBC

Definition

blood cell that contains mostly hemoglobin

 

an erythrocyte

Term
referred pain
Definition

pain that feels that it originates in an area other than the part being stimulated

Term
reflex
Definition

automatic response (nervous or chemical) to a stimulus

Term
reflex arc
Definition

a nerve pathway that includes a receptor, sensory neuron, interneuron, motor neuron, & effector organ

Term
refraction
Definition

bending of light waves so that they can focus on the retina

Term
refractory period
Definition

period during which nervous tissue cannot respond to a second stimulus

Term
renal tubule
Definition

tubular part of the nephron unit that helps make & transport urine

 

consists of Bowman's capsule, proximal conviluted tubule, loop of Henle, distal convoluted tubule, & collecting duct

Term
renin
Definition

enzyme secreted by the kidneys that causes the activation of angiotensinogen

Term
repolarization
Definition

return of the membrane potential to its resting state after the nerve impulse

Term
resistance vessel
Definition

blood vessel that can change its diameter & therefore determine resistance to the flow of blood

 

the functional name for the arterioles

Term
respiratory acidosis
Definition

increased H+ concentration (decreased pH) caused by hyperventilation

Term
respiratory alkalosis
Definition

decreased H+ concentration (increased pH) caused by hypoventilation

Term
reticular formation
Definition

complex network of nerve fibers that arises within the brain stem & projects into the lower cerebrum

 

causes arousal of the cerebrum so that the person does not slip into a coma

Term
reticulocyte
Definition

immature red blood cell

Term
retina
Definition

nervous inner layer of the eye

 

contains the photoreceptor, the rods, & cones

Term
Rh factor
Definition

type of antigen on the surface of the RBC

Term

ribonucleic acid

RNA

Definition

nucleotide that copies or trascribes the genetic code from DNA

 

also involved in translation

Term
ribosomes
Definition

organelles that are concerned with the synthesis of protein

 

"they" either are bound to endoplasmic reticulum or are free in cytoplasm

Term
rickettsia
Definition

type of small bacteria that must reproduce in a living organism

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