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MCAT Word List # MCAT/M89

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Explanation of iodine (noun)
form plural: iodines

trace element with the chemical symbol I

Sample of iodine
Iodine is needed to make thyroid hormones.



   
Explanation of blastocyst (noun)
form: no plural

the ball of stem cells that develop after a fertilized embryo divides is called a blastocyst

Sample of blastocyst
The blastocyst implants into the uterine wall seven days after fertilization.



   
Explanation of biceps (noun)
form plural: bicepses

muscle on the upper arm that moves the elbow

Sample of biceps
Biceps is the main muscle that helps the arm to lift objects.



   
Explanation of ecology (noun)
form: no plural

the relationships between all communities of living organisms and their environment

Sample of ecology
An ecologist knows all about ecology.



   
Explanation of respiratory system (noun)
form plural: respiratory systems

the lungs and airways which are involved in gas exchange

Sample of respiratory system
The respiratory system helps maintain the acid-base balance of the blood as well.

Medical term respiratory system
Dictionary.com · Cambridge Dictionaries · Merriam-Webster · Onelook.com


   
Explanation of steroid (noun)
form plural: steroids

molecule containing four rings of carbon atoms

Sample of steroid
Hormones, some vitamins and cholesterol are steroids.



   
Explanation of pupil (noun)
form plural: pupils

opening in the iris allowing light to pass through to the retina

Sample of pupil
Pupils dilate in dark environments to let in more light.



   
Explanation of insecticide (noun)
form plural: insecticides

a chemical used to kill insects

Sample of insecticide
Insecticides may be toxic to humans.



   
Explanation of portal system (noun)
form plural: portal systems

system of blood vessels starting and ending in capillaries

Sample of portal system
In the portal systems blood flows through two capillary beds prior to returning to the heart.



   
Explanation of myelin sheath (noun)
form: no plural

this is a layer of Schwann cells which covers the nerve axon

Sample of myelin sheath
The myelin sheath is an electrical insulator.



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