220-your age= predicted maximum heartbeat
The myocardium is the thickest/strongest cardiac layer.
Hope it helps!
Answer: A
Explanation: The blood–air barrier (alveolar–capillary barrier or membrane) exists in the gas exchanging region of the lungs. It exists to prevent air bubbles from forming in the blood, and from blood entering the alveoli. ... The barrier is permeable to molecular oxygen, carbon dioxide, carbon monoxide and many other gases.
Inflammation of the lungs. symptoms are chills, fever, cough, chest pain, & trouble breathing. often caused by viral or bacterial infection
