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.
Proteins have many functions in the human body. Examples of this  are: Transport- transportation of oxygen from the lungs to other  body tissues by hemoglobin. Hormonal- actâ¦s as a hormone in the  endocrine system. Receptor- forms a glycoproteins complex when a  carbohydrate is added.