A popular hypothesis for how the brain clears molecular waste, which may help explain why sleep feels refreshing, is a ...

Inside you, there is an amazing network of blood vessels, the tubes that carry blood all around your body. Every part of the body needs oxygen, food and water. The blood vessels are a bit like ...

Techniques for blood collection from the rat ... Either heating the tail or heating the rat's core body temperature will cause vasodilation of the tail vessels. Firmly pressing your index finger ...

So it's a good job we've got the circulatory system to transport nutrients, water and oxygen to the entire body. Your circulatory system is made up of three parts: the heart, blood vessels and the ...