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anus
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Anus
Opening at the end of the alimentary canal which allows undigested foods and other waste materials to pass out of the body in the form of faeces. In humans the term is also used to describe the last 4 cm/1.5 in of the alimentary canal. It is normally kept closed by a ring of muscle called a sphincter. A common medical condition in humans associated with the anus is haemorrhoids (piles).
The anus is found in all types of multicellular animal except the coelenterates (sponges) and the platyhelminths (flatworms), which have a mouth only.
© RM 2009. Helicon Publishing is division of RM.
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alimentary canal
amino acid
amylase
anus
balanced diet
bile
bloodstream
carbohydrate
colon (anatomy)
diffusion
digestion
duodenum
egestion
emulsify
enzyme
fat
fatty acid
fibre, dietary
food test
glycerol
growth (biology)
ileum
intestine
lipase
liver
mineral salt
mouth
nutrition
oesophagus
organ (anatomy)
pancreas
pepsin
peristalsis
protease
protein
repair
saliva
stomach
stomach acid
villus
vitamin
water
amino acid
amylase
anus
balanced diet
bile
bloodstream
carbohydrate
colon (anatomy)
diffusion
digestion
duodenum
egestion
emulsify
enzyme
fat
fatty acid
fibre, dietary
food test
glycerol
growth (biology)
ileum
intestine
lipase
liver
mineral salt
mouth
nutrition
oesophagus
organ (anatomy)
pancreas
pepsin
peristalsis
protease
protein
repair
saliva
stomach
stomach acid
villus
vitamin
water
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