One reason that faeces may be black in colour and tar-like is that:
a. there is an absence of bile.
b. there is a gastrointestinal infection.
c. there is the presence of blood from intestinalbleeding
d. helminths may be present.
c
Bleeding from the oesophagus or stomach (and to a
lesser degree the small intestine) can lead to faeces being a
black colour and ‘sticky' in consistency.
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_______ are protective stretch receptors located in the aortic arch and the carotid sinuses at the bifurcation of the external and internal carotid arteries.
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