Page 33 - ICC Science Dictionary (spreads)

Word Definition Topic(s) Word Definition Topic(s)

heart An operation to replace a B2 horizontal A line with zero slope. P3
transplants damaged heart with a healthy
heart from a donor. hormone Chemical messenger produced in B2, B3, B5
glands and carried by the blood
heat A flow of energy, measured in TP6 to specific organs in the body.
joules (J). Heat will transfer from a
hotter object to a cooler object. horticulture Growing of fruit, vegetables and B5
flowers.
hepatitis Inflammation or swelling of the B2
liver, for example because of host The organism lived on or in by a B3
infection by a virus or drinking too parasite.
much alcohol. human The ribs and upper backbone, B2

herbivore An animal that feeds only on plants. B3 thorax and the organs found in the chest.
humidity The amount of water vapour in B1a, B1b, B4
herd The protection given to a B3 the atmosphere measured as a
immunity population against an outbreak percentage.
of a specific disease when a very
high percentage of the population hybrid car A car that uses petrol/diesel and TC6
have been vaccinated against it. electricity to work.
heterozygous This describes a genotype in which B6 hybridoma Cells formed from fusing spleen B3
the two alleles for a particular cells with myeloma cells which will
characteristic are different. produce monoclonal antibodies.

histogram A graphical representation of the B2 hydrated Containing water of crystallisation, C6
distribution of numerical data. which can be removed by
heating strongly.
HIV Human Immunodeficiency Virus, B3
a disease which damages cells in hydration Chemical reaction in which water C3, C7
the immune system. reacts with a substance.

homeostasis The maintenance of a constant B5 hydrocarbon A compound that contains B5, C7, C9
internal environment in the body. hydrogen and carbon only.

homologous A 'family' of organic compounds C7 hydroelec- Electricity that is generated by the P1
series that have the same functional group tricity movement of water.
and similar chemical properties.

homozygous This describes a genotype in B6
which the two alleles for the
characteristic are identical.