Not all spider bites are bad, in fact, most are not, but there are a few spiders that when they bite, they do incredible damage like the brown recluse below!pider Identification. Spiders can be found living in almost every habitat on earth. The only place that spiders are not found is only the harshest environments on Earth, the North and South poles, the highest mountains and the ocean. Some spiders have been found near the ocean, living in coral near the ocean edge.
A milliliter of blood contains about 5 billion red blood cells, each of which is packed with about 300 million hemoglobin molecules! A milliliter of blood contains about 5 billion red blood cells, each of which is packed with about 300 million hemoglobin molecules!
Answer Wiki. One unit of packed red blood cells (PRBC) contains about 180 ml of actual RBC, and is 310 ml total (270-350 ml). PRBC will typically have a hematocrit of 57-58% (50-65%). (The unit of PRBC usually also still contains 30 ml of plasma (without coagulants), and 100 ml of Optisol.