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| Description of yolk sac (noun: plural: yolk sacs) vitelline sac; the membranous sac that lies ventral to the embryo Samples of yolk sac The yolk sac is one of the first places where blood cells are made.
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| Description of cramp (noun: plural: cramps) painful spasm of the muscle Samples of cramp Cramps may be caused by imbalance of salts in the blood.
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| Description of isoelectric point (noun: no plural) pH at which the electrolyte concentration of an amphoteric substance such as protein is electrically zero Samples of isoelectric point A protein may be characterized by its isoelectric point being the pH at which its net charge is zero.
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| Description of olfactory bulb (noun: plural: olfactory bulbs) end of the olfactory lobe where the olfactory nerves start Samples of olfactory bulb The olfactory nerves project directly to the olfactory bulbs.
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| Description of iris (noun: plural: irises) part of the eye that controls the pupil size Samples of iris The iris is the colored part of the eye.
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| Description of hydrogen (noun: plural: hydrogens) smallest, commonest atom made of one proton and electron; chemical element with the symbol H that makes up most organic compounds Samples of hydrogen Hydrogen is used to hydrogenate vegetable oils to make margarines and spreads. Hydrogen is found in water.
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| Description of mandible (noun: plural: mandibles) the jawbone Samples of mandible Muscles connecting the mandible to the base of the skull allow opening of the mouth and chewing.
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| Description of basal metabolic rate (noun: no plural) the amount of energy expended by the body in order to survive at complete rest Samples of basal metabolic rate Starvation slows the basal metabolic rate.
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| Description of excretion (noun: no plural) discharging waste products from the body Samples of excretion The kidneys regulate the concentration of salt and water in the blood through excretion of urine.
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| Description of endometrium (noun: plural: endometria) mucous internal lining of the uterus Samples of endometrium The endometrium is built up in the menstrual cycle and shed at menstruation.
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