OCR GCSE Biology A key terms

A blood vessel that carries blood towards the heart.

The number of complete breaths taken in one minute.

One of the two lower chambers of the heart, which pumps blood out of the heart.

A non-cellular infectious agent that replicates only inside a living host cell.

The amount of three-dimensional space occupied by an object, measured in cubed units such as cm³.

The continuous movement of water between the atmosphere, land, bodies of water and living organisms.

A measure of the tendency of water to move from one place to another; a more dilute solution has a higher water potential than a more concentrated one.

The absorption of water from the soil into a plant, mainly through root hair cells by osmosis.

The state of being comfortable, healthy and able to function physically, mentally and socially.

Plant tissue made mainly of hollow, lignified vessels that transport water and dissolved mineral ions from the roots and also support the plant.

A long conducting tube formed from dead xylem vessel elements joined end to end.

A clear area around an antimicrobial disc where visible bacterial growth has been inhibited.