Glossary with audio assistance

nerve fibres that carry impulses from the central nervous system to a somatic structure

nerve fibres that carry impulses from a somatic structure to the central nervous system

structures that lie in the skin and the musculoskeletal system

organs that have evolved to house the exteroreceptors of the body

muscular ring that controls flow in and out of an organ

any of the pairs of nerves that arise from the spinal cord

Repair by regeneration is sometimes possible.

the presence of excess fat in faeces

bile pigment found in faeces and responsible for the characteristic colour of faeces

the destruction of all microorganisms and their spores