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Human Body Glossary S - Z
Human Body Glossary S - Z
108
Nursing
Professional
07/17/2010

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Cards

Term
sagittal plane
Definition

verticle plane that divides the organ or body into right & left parts

 

A mid"one" divides the body into right & left halves.

Term
sacomere
Definition

contractile unit of a muscle extending from Z line to Z line

 

contains the contractile proteins, actin & myosin

Term
sarcoplasmic reticulum
Definition

calcium-storing endoplasmic reticulum located in the muscle

Term
sclera
Definition

outer layer of the eyeball

Term
scrotum
Definition

pouch of skin that encloses the testes

Term
sebacceous gland
Definition

exocrine gland located in the skin that secretes sebum

Term
sebum
Definition

oily secretion of a sebaceous gland

Term
second messenger
Definition

chemical that is activated in response to hormonestimulation, such as cAMP

Term
semen
Definition

sperm-containing secretion of the male

Term
semilunar valve
Definition

valve shaped like a half-moon located between the ventricles & their attached vessels

 

pulmonic valve & aortic valve

Term
sensory nerves
Definition

collection of sensory neurons that carry information toward the central nervous system (CNS)

Term
serous membrane
Definition

membrane that covers an organ or lines cavities that do not open to the outside

 

includes the pleurae

Term
serum
Definition

blood plasma nius the clotting factors

Term
sex-linked trait
Definition

any trait that is carried on a sex chromosome (X or Y chromosome)

Term
sinus
Definition

cavity such as the paranasal sinuses in the head

Term
sinusoid
Definition

large, highly permeable capillary that permits free movement of proteins between the tissue fluid & the blood

Term
skeletal muscle
Definition

striated, voluntary muscle that lies over parts of the skeleton

 

causes movement of the skeleton

Term
skin turgor
Definition

refers to the degree of elasticity of the skin

Term
smooth muscle
Definition

nonstriated, involuntary muscle found in tubes & organs

Term
solute
Definition

a substance that is dissolved in another solution (solvent)

Term
solution
Definition

mixture in which the particles that are mixed together remain evenly distributed

Term
solvent
Definition

substance in which the solute is dissolved or mixed

Term
somatic nevous system
Definition

part of the peripherial nervous system that stimulates the skeletal muscles

Term
specific gravity
Definition

weight of urine compared with the weight of an equal volume of water

Term
spermatogenesis
Definition

formation of sperm

Term
sphincter
Definition

circular muscle that opens & closes a tube, such as the anal _________.

Term
spinal cavity
Definition

elongated cavity that contains the spinal cord

 

the vertebral cavity

Term
spinal cord
Definition

part of the central nervous system (CNS) located in the vertebral canal 

Term
spinal nerves
Definition

nerve that arises from the spinal cord

Term
splanchnic circulation
Definition

blood supply of the abdominal organs of digestion

Term
spleen
Definition

lymphoid organ located in the left upper quadrant (LUQ) of the abdominal cavity

Term
spores
Definition

an encasement that allows the organism to withstand harsh environmental conditions

Term
squamous epithelium
Definition

flattened, scalelike epithelial cells

 

simple or striated

Term
Starling's law of the heart
Definition

refers to the relationship between myocardial stretch & the strength of myocardial contration

Term
steroid
Definition

lipid-soluble hormone such as estrogen, testosterone, & cortisol

Term
stomach
Definition

a digestive organ located between the esophagus & the duodeum

Term
stratum corneum
Definition

outermost layer of the epidermis

Term
stratum germinativum
Definition

innermost layer of the epidermis where cell division takes place

Term
stroke volume
Definition

amount of blood that the ventricle pumps in one beat

Term
subcutaneous layer
Definition

tissue beneath the dermis that contains fat cells

Term
sudoriferous gland
Definition
sweat gland
Term
surfactant
Definition

chemical substance that reduces surface tension thereby preventing the collapse of alveoli

Term
suspension
Definition

mixture in which the large particles gradually settle to the bottom unless continuously shaken or agitated

Term
suture
Definition

type of imovable joint found between the bones of the skull

Term
sympathetic nervous system
Definition

a division of the autonomic nervous system that causes "fight or flight" response

Term
synapse
Definition

the interaction between two nerves where chemical transmision of the electrical signals occurs

Term
synergist
Definition

a muscle that assists or works with another muscle

Term
synovial joint
Definition

freely movable joint

Term
systemic circulation
Definition

part of the circulatory system that serves all parts of the body except the blood vessles that supply the gas-exchanging portions of the lungs

Term
systole
Definition

contraction of the myocardium

Term

systolic blood pressure

SBP

Definition

the blood pressure in the large arteries during cardiac contraction (systole)

 

the upper part of a BP reading

Term
target tissue
Definition

tissue at which a hormone is aimed

Term
T cell
Definition

type of lymphocyte that engages in cell mediated immunity

 

a T lymphocyte

Term
temporal lobe
Definition

lobe of the cerebrum that is responsible for hearing smelling, speech, & memory

Term
tendon
Definition

strong band of connective tissue that anchors muscle to bone

Term
teratogen
Definition

means "monster-producing"

 

anything that causes developmental abnormalities in the embryo or fetus, such as the rubella virus, alcohol, or radiation

Term
testes
Definition

male gonads that produce sperm & testosterone

Term
testosterone
Definition

most important androgen (male hormone)

Term
tetanus
Definition

sustained muscle contractions

 

also a disease caused by Clostridium tetani pathogen

Term
thermoreceptor
Definition

receptor that detects changes in temperature

Term
thermoregulation
Definition

homeostatic regulation of body temperature by adjustments in the heat-producing & heat-losing mechanisms

Term
thoracic cavity
Definition

upper part of the ventral cavity that superior to the diaphragm

 

it is filled largely by the lungs & heart

Term
thoracic duct
Definition

large lymphatic vessel that receives lymph & empties it into the left subclavian vein

Term
thromobcyte
Definition

see platelet

Term
thoracoumbar outflow
Definition

sympathetic nerve activity

 

"flight or flight"

Term
thymus gland
Definition

lymphoid organ that plays an important role in immunity

Term
thyroid gland
Definition

gland that secretes T3' T4 (thyroxine), & calcitronin

Term
tidal volume
Definition

amount of air that is inhaled & exhaled during one ventilatory cycle

Term
tissue
Definition

groups of cells that perform a similar function

Term
tonsils
Definition

patches of lymphnoid tissue embedded in the throat region

Term
tonus
Definition

the continuous contraction of a muscle

Term
toxoid
Definition

inactivated toxin that retains its antigenic properies

Term
trachea
Definition

large airway located between the larynx & the bronchus

 

windpipe

Term
transcellular fluid
Definition

extracellular fluid that includes cerebrospinalfluid, aqueous & vitreous humor, synovial fluid of the joints, serous fluid within body cavities, & exocrine gland secretions (ex: gastric juice)

Term
transverse plane
Definition

plane that divides the body into top (superior) & bottom (inferior) parts

Term
tricuspid valve
Definition

atrioventricular valve found between the right atrium & right ventricle

Term
tubular reabsorption
Definition

movement of water & dissolved substances from the tubules into the peritubular capillaries

Term
tubular secretion
Definition

movement of substances from the peritubular capillaries into the tubules

Term
turgur
Definition

a condition of normal tensionwithin a cell

Term
umbilical cord
Definition

long structure that connects the fetus to the placenta

 

contains the umbilical arteries & the umbilical vein

Term
urea
Definition

nitrogensous waste product formed by the liver & excreted by the kidneys

Term
ureter
Definition

tube that conducts urine from the kidney to the urinary bladder

 

there are two "of them"

Term
urethra
Definition

tube that conducts urine from the bladder to the exterior of the body

Term
uterus
Definition

hollow reproductive organ in which the fetus grows

 

the womb

Term
vaccine
Definition

antigens that have been altered so as to produce active immunity without causing the disease

Term
vascular resistance
Definition

the amount of opposition that blood vessels offer to the flow of blood

 

most resistance is caused by the arterioles (resistance vessels)

Term
vas deference
Definition

tube that carries sperm from the epididymis to the ejaculatory duct

 

the ductus  deferens

Term
vasoconstriction
Definition

narrowing of blood vessels

 

usually refers to arterioles

Term
vasodialation
Definition

widening of blood vessels

 

usually refers to arterioles

Term
vector
Definition

a carrier of pathogens from host to host

 

mechanical or animal

Term
vein
Definition

blood vessels that takes blood toward the heart

Term
vena cava
Definition

large vein that takes unoxygenated blood to the right atrium

 

superior & inferior ____ ____.

Term
ventilation
Definition

moving air into & out of the lungs

 

Two phases: inhalation (breathing in) & exhalation (breathing out)

Term
ventral cavity
Definition

cavity that is located toward the front part of the body

 

divided by the diaphragm into the upper thoracic cavity & the lower abdominopelvic cavity

Term
ventral root
Definition

attachment of a motor branch of a spinal nerve to the spinal cord

Term
ventricle
Definition

cavity in an organ, such as the "this" in the heart & brain

Term
venule
Definition

tiny vein

Term
vernix caseosa
Definition

cheeselike substance covering the skin of the fetus

 

secreted by the sebaceous glands

Term
vestibule
Definition

part of the inner ear that is concerned with equalilibrium

Term

villi

villus (singular)

Definition

fingerlike projections such as the _____ that line the intestine

 

funsction in absoption

Term
virus
Definition

pieces of either DNA or RNA surrounded by a protein shell

 

"these" are parasitic in that they require other living cells for reproduction

Term
viscera
Definition

internal organs of the body

Term
vital capacity
Definition

the greatest amount of air that can be exhaled following the maximal inhalation

Term
vitamin
Definition

organic substance that is necessary for normal metabolism

Term

white blood cell

WBC

Definition

see luekocyte

Term
white matter
Definition

myelinated fibers, mostly axons, that are located in the central nervous system (CNS)

Term
zoonosis
Definition

a disease that occurs primarily in the wild but can be transmitted from animals to humans

Term
zygote
Definition

fertilized ovum

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