Which Spiders Have Blood?
WouterSpiders are small, but they have a very complex circulatory system. Their blood is called hemolymph, and it resembles human blood. However, there are some key differences.
The main difference between spider and mammalian blood is that the blood of spiders is not red. Instead, it is pale blue. In addition, it is not made of haemoglobin, an oxygen-carrying pigment that is found in human blood. Rather, it consists of a liquid that is mostly water and a substance called hemocyanin. This substance is a type of protein that looks transparent and is made of copper. It is used for transportation and to enable the immune response.
Spiders have two types of respiratory organs: book lungs and tracheae. The book lungs are hollow leaf-like structures that are exposed to the air. They are connected to a tube. The tracheae are long tubes that run through the body.
The tracheae diffuse the oxygen from the lungs into the blood. This helps spiders get the oxygen they need. The tracheae also help spiders transport carbon dioxide into the air.
Some species of spider have only one pair of book lungs. Others have two. The book lungs provide the best circulation for spiders. The tracheae are connected to the lungs and the heart. This allows the spider to get an equal supply of oxygen and to avoid collapsing.
The book lungs are the most developed respiratory organs in spiders. They have hollow leaf-like structures that contain a thin cuticle. The tracheae are connected and they are kept from collapsing.
