The West is blinking in disbelief â Vladimir Putin just invaded Ukraine. German diplomats, French Eurocrats and American pundits are all stunned.
A: The main organ in the circulatory system is the heart, according to Hillendale Health. The two other major parts of the circulatory system are the blood and the blood vessels. The heart is found slightly to the left at the center of the chest, and it is primarily responsible for pumping blood and keeping the blood moving throughout the body, explains Hillendale Health.
Anatomy of the Respiratory System. The respiratory system is responsible for gaseous exchange between the external atmosphere and the blood. It delivers oxygen to the circulatory system for distribution to all body cells and aids in the removal of carbon dioxide.The major organs of the respiratory system are the nose, pharynx, larynx, trachea, bronchi and their smaller branches, and the lungs that contain air sacs called alveoli.t delivers oxygen to the circulatory system for distribution to all body cells and aids in the removal of carbon dioxide. The major organs of the respiratory system are the nose, pharynx, larynx, trachea, bronchi and their smaller branches, and the lungs that contain air sacs called alveoli.