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Definition of yolk sac, cramp, isoelectric point, olfactory bulb, iris, hydrogen, mandible, basal metabolic rate, excretion, endometrium

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Definition of yolk sac (noun)
form plural: yolk sacs

vitelline sac; the membranous sac that lies ventral to the embryo

Examples
The yolk sac is one of the first places where blood cells are made.

Definition of yolk sac
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Definition of cramp (noun)
form plural: cramps

painful spasm of the muscle

Examples
Cramps may be caused by imbalance of salts in the blood.

Definition of cramp
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Definition of isoelectric point (noun)
form: no plural

pH at which the electrolyte concentration of an amphoteric substance such as protein is electrically zero

Examples
A protein may be characterized by its isoelectric point being the pH at which its net charge is zero.

Definition of isoelectric point
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Definition of olfactory bulb (noun)
form plural: olfactory bulbs

end of the olfactory lobe where the olfactory nerves start

Examples
The olfactory nerves project directly to the olfactory bulbs.

Definition of olfactory bulb
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Definition of iris (noun)
form plural: irises

part of the eye that controls the pupil size

Examples
The iris is the colored part of the eye.

Definition of iris
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Definition of hydrogen (noun)
form plural: hydrogens

smallest, commonest atom made of one proton and electron; chemical element with the symbol H that makes up most organic compounds

Examples
Hydrogen is used to hydrogenate vegetable oils to make margarines and spreads.
Hydrogen is found in water.

Definition of hydrogen
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Definition of mandible (noun)
form plural: mandibles

the jawbone

Examples
Muscles connecting the mandible to the base of the skull allow opening of the mouth and chewing.

Definition of mandible
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Definition of basal metabolic rate (noun)
form: no plural

the amount of energy expended by the body in order to survive at complete rest

Examples
Starvation slows the basal metabolic rate.

Definition of basal metabolic rate
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Definition of excretion (noun)
form: no plural

discharging waste products from the body

Examples
The kidneys regulate the concentration of salt and water in the blood through excretion of urine.

Definition of excretion
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Definition of endometrium (noun)
form plural: endometria

mucous internal lining of the uterus

Examples
The endometrium is built up in the menstrual cycle and shed at menstruation.

Definition of endometrium
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