According to the Bohr model, the wavelength of the light emitted by a hydrogen atom when the electron falls from a high energy (n = 4) orbit into a lower energy (n = 2) orbit.
A network of arteries and veins also carry blood throughout the body: Arteries transport blood from the heart to the body tissues. Veins carry blood back to the heart.ow the heart works. The heart is a large, muscular organ that pumps blood filled with oxygen and nutrients through the blood vessels to the body tissues. It's made up of: Four chambers. The two upper chambers, the atria, receive and collect blood.
Blood flows to the brain through thick, strong arteries. Some children have diseases that can damage the walls of their arteries. When this happens, the arteries can start to leak blood. If this happens in the brain, it can cause a hemorrhagic stroke. Your doctor will explain to you if your child has an illness that can damage the blood vessels and cause a stroke.