nerve fibres that carry impulses towards the central nervous system

the presence of pathogenic bacteria in the blood

the fluid that separates from blood when it clots

the pair of chromosomes that determine the gender of an individual

gene that influences a characteristic seen in either the male or the female

gene carried on one of the sex chromosomes

the clarity of structures on a radiograph

increased numbers of immature white blood cells circulating in the blood

cavity within a bone or other tissue; paranasal sinuses are air-filled cavities in the bones of the face

system of membrane-bound tubes and sacs that is involved in the synthesis of lipids