The waste product from the breakdown of excess protein, excreted in the urine.
A medicine that contains a dead or inactive form of a pathogen that is inserted into the body
Differences between indviduals within a species or between species
A medical procedure in which sperm ducts are cut or blocked. This acts as a contraceptive method.
The narrowing of a blood vessel to reduce bloodflow to an area
The widening of a blood vessel to increase blood flow to an area
An organism that can spread disease
A blood vessel that returns blood to the heart
The physical act of filling (inhalation) and emptying (exhaling) the lungs with air
The larger of the two types of chambers found in the heart, located below the atria
Microscopic finger-like projections found on the surface of some cells
Dead columnar cells that form tubes to transport water and minerals through plants
The amount of an agricultural product produced
Tiny animals found in the sea and fresh water