The AV valves close first, then the semilunars open and close, then the AV valves open
True Because if you think about it , it makes total sense
Answer:
A. C. and mabye D.
Explanation:
dont delete the answer please! its self explanatory.
Answer:
This is called Chronic obstructive pulmonary disease (often called "COPD")
Explanation:
COPD is a condition in which the airways in the lungs become inflamed and narrowed and the air sacs become damaged. Smoking cigarettes is the most common cause of COPD
Hope it helps :)
