Answer
Elastin fibers are glycoproteins found in the lungs and are usually in large quantities. The abundant elastin fibers are helpful in the recoil process of the lungs after being expanded by the muscles of the respiratory system.
During inhalation,the diaphragm and intercostal muscles expand the chest. This forms a negative pressure and draws the air in.The Lungs recoil to expel used up air during exhalation.
Answer:
it enters the "main sequence" phase of its life
Explanation:
The Peripheral Nervous System or PNS
accelerate to the left: bottom right box
middle right box
accelerate to the right: bottom left box
top right box
top left box
no acceleration; middle right box
The answer is D. in an area uncovered by a retreating glacier (Apex)
