American House Spider (Parasteatoda tepidariorum)
The American house spider or Common spider (Parasteatoda tepidariorum) is indigenous to most of North America. It feeds on flies, mosquitoes, ants, and other insects. This spider has an open circulatory system. This blood system contains a heart, veins, and arteries. However, it lacks capillaries. The heart of the spider is located in the back of the abdomen. The heart has valves that keeps the blood flow in one constant direction. The heart of the American house spider pumps blood into a body cavity and it circulates to other organs. The heart also has its own nervous center. This allows the heart to beat independently. This spider evolved during the middle of the Cambrian period.
The blood of the spider is blue because of the presence of haemocyanin. Haemocyanin is a protein that is responsible to transport oxygen, nutrients, and hormones around the blood. It is not stored in a cell, but it circulates freely in the blood. The spider receives the oxygen it needs to survive because of the haemocyanin protein moving through the blood. The blood of the American house spider also raises the blood pressure of the spider when it sheds old skin or when the spider stretches its legs.
The blood of the spider is blue because of the presence of haemocyanin. Haemocyanin is a protein that is responsible to transport oxygen, nutrients, and hormones around the blood. It is not stored in a cell, but it circulates freely in the blood. The spider receives the oxygen it needs to survive because of the haemocyanin protein moving through the blood. The blood of the American house spider also raises the blood pressure of the spider when it sheds old skin or when the spider stretches its legs.