This document defines and distinguishes several medical terms related to vomiting and defecating blood. It defines melenemesis as vomiting black material, hematochezia as passing fresh blood through the anus, and hematemesis as vomiting blood. It notes that coffee ground emesis refers to melenemesis and that the logical terms are melenemesis versus hematemesis and melanochezia versus hematochezia.
3. Haematochezia
Haematochezia is the passage of fresh blood through the anus,
usually in or with stools (contrast with melena).The term is from
Greek αἷμα ("blood") and χÎζειν ("to defaecate"). Hematochezia is
commonly associated with lower gastrointestinal bleeding,
4. Melanin
Melanin (/ˈmÉ›lÉ™nɪn/ (About this soundlisten); from Greek: μÎλας
melas, "black, dark") is a broad term for a group of natural
pigments found in most organisms.
6. Coffee ground emesis = MELENEMESIS
Coffee ground emesis refers to a particular appearance of vomit.
Within organic heme molecules of red blood cells is the element
iron, which oxidizes.