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.
Rating Newest Oldest. Best Answer: The three main types of blood vessels in the body are arteries, veins, and capillaries. Arteries The arteries are elastic, muscular tubes that carry blood away from the heart, into the capillaries.The walls of the arteries are thicker than the other blood vessels due to higher blood pressure being present in arteries.Note that arteries don't always carry oxygenated blood, as is the case with the pulmonary artery. Veins The veins carry blood from capillaries back to the heart.he walls of the arteries are thicker than the other blood vessels due to higher blood pressure being present in arteries. Note that arteries don't always carry oxygenated blood, as is the case with the pulmonary artery. Veins The veins carry blood from capillaries back to the heart.