Biology Key Word Definitions (O)

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What is obese?
Very overweight, with a BMI of over 30.
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What is oestrogen?
Female sex hormone which stimulate the lining of the womb to build up in preparation for a pregnancy.
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What is oral contraceptive?
Hormone contraceptive that is taken by mouth.
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What is the organ system?
A group of organs working together to carry out a particular function.
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What is organic waste?
Waste material from living organisms, e.g. garden waste.
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What is osmosis?
The net movement of water from an area of high concentration (of water) to an area of low concentration (of water) along a concentration gradient.
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What is ova?
The female sex cells, eggs.
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What is an ovary?
A female sex organ which contains the eggs and produces sex hormones during the menstrual cycle.
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What is overweight?
A person is overweight if their body carries excess fat and their BMI is between 25 and 30.
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What is an ovipositor?
A pointed tube found in many female insects which is used to lay eggs.
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What is ovulation?
The release of a mature egg from the ovary in the middle of the menstrual cycle.
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What is oxygen debt?
The extra oxygen that must be taken into the body after exercise has stopped to complete the aerobic respiration of lactic acid.
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What does oxygenated mean?
Containing oxygen.
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What is oxyhaemoglobin?
The molecule formed when haemoglobin binds to oxygen molecules.
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Card 2

Front

What is oestrogen?

Back

Female sex hormone which stimulate the lining of the womb to build up in preparation for a pregnancy.

Card 3

Front

What is oral contraceptive?

Back

Preview of the front of card 3

Card 4

Front

What is the organ system?

Back

Preview of the front of card 4

Card 5

Front

What is organic waste?

Back

Preview of the front of card 5
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