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!
A red blood cell contains about 200 million hemoglobin molecules. If all this hemoglobin was in the plasma rather than inside the cells, blood would be so thick that the heart would have a difficult time pumping it through.he thickness of blood is called viscosity. The greater the viscosity of blood, the more friction there is and more pressure is needed to force blood through the heart and vessels.Since hemoglobin is a respiratory pigment the efficiency of oxygen transport is high in this closed and packaged model of the red blood cell.