Key terms & definitions

The release of a mature egg from an ovary.

The release of an egg from an ovary.

Personal money that an owner invests in their business.

A curved lake formed when a meander is cut off from the main river channel.

A curved lake separated from the main river channel after a meander has been cut off.

A reaction in which a substance combines with oxygen or loses electrons; glucose is completely oxidised in aerobic respiration but incompletely oxidised in anaerobic respiration.

The loss of electrons by a substance.

The loss of electrons by a particle.

A chemical reaction in which a substance combines with oxygen; metal oxidation can produce a metal oxide.

A chemical reaction involving oxygen in this food-preparation context; it can cause browning and destroy vitamin C.

The charge associated with an element in a compound or ion, often shown by a Roman numeral in a transition-metal compound's name.

A compound containing oxygen and at least one other element.

A compound of oxygen with one other element.

A general name for several compounds of nitrogen and oxygen, often written as NOₓ.

Gases made of nitrogen and oxygen, collectively written as $\mathrm{NO_x}$, that cause respiratory problems and contribute to acid rain.

A chemical reaction involving oxygen; in food preparation, exposure to oxygen can cause changes such as browning.

Able to cause or intensify burning by supporting oxidation.

Describes a substance that can support combustion, for example by providing oxygen, and make a fire more intense.

A substance that causes another substance to be oxidised; chlorine acts as an oxidising agent when it bleaches coloured substances.

A substance that causes another substance to gain oxygen. In an oxygen-transfer reaction, the oxidising agent loses oxygen and is reduced.

A gas that supports combustion and makes a glowing splint relight.

Blood containing a relatively high concentration of oxygen after gas exchange in the lungs.

Blood containing oxygen that can be delivered to body cells for aerobic respiration.

Blood with a relatively high oxygen content, such as blood returning from the lungs to the heart.

The amount of oxygen the blood can transport to body tissues, including working muscles.

The amount of extra oxygen the body needs after exercise to react with accumulated lactic acid and remove it from cells.

(HT only) The amount of extra oxygen the body needs after exercise to react with accumulated lactic acid and remove it from the cells.

The additional oxygen needed after exercise to help the body recover, including dealing with lactic acid produced during anaerobic exercise.

The volume of oxygen produced per unit time, used as a measure of the rate of photosynthesis in an aquatic plant.

The substance formed when oxygen binds to haemoglobin.