The human heart is a vital organ that pumps blood through the circulatory system. It consists of four chambers—two atria and two ventricles. Its rhythmic contractions maintain blood circulation and oxygenate tissues.
Which chamber of the heart (6, 7, 8 or 9) pumps blood to the lungs for oxygenation, name it? Identify and name the blood vessels that carry blood to the lungs. b) Identify the structure at number 12 and state its function. c) Why do chambers 6 and 7 have thicker muscular walls than chambers 8 and 9? Name each of these chambers.
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a) 7. Right ventricle, 2. Pulmonary arteries.
b) Valves – They ensure that blood does not flow backwards when atria or ventricles contract.
c) Left and right Ventricles (6 and 7) have thicker walls as compared to left and right atria (8 and 9). They have to pump blood out of the heart. They pump blood at a higher pressure to ensure it reaches all parts of the body.