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.
Although children are smaller, the vessels from their circulatory system are still long enough to wrap around the world more than two times, says The Franklin Institute. The vessels of adults can wrap around the world more than two and a half times. There are three types of blood vessels, including arteries, veins and capillaries. Related Questions.