Answer:The pulmonary circulation is the portion of the circulatory system which carries deoxygenated blood away from the right ventricle, to the lungs, and returns oxygenated blood to the left atrium and ventricle of the heart. The term pulmonary circulation is readily paired and contrasted with the systemic circulation.
Answer:
I think it may be vaccine because it's man made
Strain
Strain is known to be an injury that affects the muscle or tendon by causing twist or tear of a tendon or muscles. Thus, strain can either be complete or partial tear of the muscles or tendon or simple overstretch of the tendon or muscle. Furthermore, strain can be classified as chronic or acute strain.
