Unlike humans, spiders have an open circulatory system. The spider's simple heart, a tube surrounded by muscles with one-way valves at both ends, pumps blood into the body cavities around the spider's organs. Since the organs are submerged in blood, they take in oxygen.
How does the spider's body work?
Spiders, like most arthropods, have an open circulatory system. That is, there is no true blood or veins that carry it. Rather, their bodies are filled with blood lymph, which is sent by the heart through the arteries into a space called the paranasal sinuses that surrounds their internal organs.
What is the spider's body made of?
Like other arthropods, the spider's body is covered with a more or less hard "skin" or cuticle (exoskeleton) made of protein and chitin. The spider cuticle is made up of several layers, the outermost being the toughest and covered with a thin surface wax layer that helps reduce the loss of water from the body.
Does the spider have a brain and a heart?
Now your heart is pumping red blood and oxygenating your body. Interestingly, even if you cover the insect's mouth, you can still breathe. Insects breathe through hundreds of small holes in their bodies. But they still need a heart.
How does Spider Heart work?
The abdomen of all spiders usually has a variable number of openings (mouths) along the sides, with arteries to carry blood (blood lymph) forward when the heart contracts. There are arteries to carry it backwards. The small hole closes during contraction.
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