976
GLOSSARY
Y
yellow marrow
(yel
o mar
o)
Fat
storage tissue in the cavities in
certain bones. p. 203
yolk sac
(yo
¯k sak)
Extraembryonic
membrane connected to the embryo
by a long, narrow tube. p. 891
Z
zona pellucida
(zo
nah pel-u
cı˘-dah)
Thick, transparent, noncellular layer
surrounding a secondary oocyte.
p. 849
zygote
(zi
go
¯t)
Cell produced by the
fusion of an egg and sperm; a
fertilized egg cell. p. 849
zymogen granule
(zi-mo
jen gran
-u
¯l)
Cellular structure that stores inactive
forms of protein-splitting enzymes in
a pancreatic cell. p. 671
water of metabolism
(wot
er uv me
˘-tab
o-
lizm)
Water produced as a by-
product of metabolic processes. p. 813
white blood cell
(whı¯t blud sel)
Cell
that helps ± ght infection; leukocyte.
p. 162
white F
ber
(whı¯t ±
ber)
Fast-
contracting skeletal muscle ± ber.
p. 299
wild type
(wı¯ld tı¯p)
Phenotype or
allele that is the most common for a
certain gene in a population. p. 920
X
X-linked trait
(eks-linkt
tra
¯t)
Trait
determined by a gene on an X
chromosome. p. 920
x-ray
(eks
ray)
Used as a verb: to
photograph using radiation. p. 679
X ray
(eks ray)
Used as a noun: a
photograph produced by radiation.
May also be used as an adjective:
X-ray. p. 202
vitamin
(vi
tah-min)
Organic
compound other than a
carbohydrate, lipid, or protein
needed for normal metabolism but
that the body cannot synthesize
in adequate amounts and must
therefore be obtained in the diet.
p. 119
vitreous body
(vit
re-us bod
e)
Collagenous ±
bers and fl uid in the
posterior cavity of the eye. p. 469
vitreous humor
(vit
re-us hu
mor)
Fluid between the lens and the
retina of the eye. p. 469
vocal cords
(vo
kal kordz)
Folds of
tissue in the larynx that produce
sounds when they vibrate. p. 740
voluntary
(vol
un-ta
¯r
e)
Consciously
controlled. p. 163
W
water balance
(wot
er bal
ans)
When
the volume of water entering the
body is equal to the volume leaving
it. p. 813
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