All living things are made of cells ... system in humans – WJEC The proper functioning of the circulatory system is essential for health. Blood transports substances around the body to every ...

They travel through your spinal cord and out to nerves that extend like wires throughout your body. Your nervous system uses billions of tiny, connected nerve cells ... of key organs and fiber ...

Engineers at the University of Pittsburgh develop 3D-printed collagen scaffolds, enabling organic tissue models that mimic ...

Compare the number of mitochondria in muscle and skin cells. Why are there so many in muscle cells? What other cells will have a lot of mitochondria?