The diaphragm is a sheet of internal skeletal muscle. when relaxed it's domed shaped smooth muscle. upon contraction it reduces in length hence pulling inward which then increases the lung volume creating a negative pressure relative to the aveoli. This ensures that proper gas exchange occurs. Now when the diaphragm relaxes, it returns back into is dome shape ( longer in length) and pushes upward thereby reduces the lungs volume and increasing the pressure relative to the surrounding thus you exhale.
Another simple way to approach it is by playing around with PV=nRT in your head if you must.
When the diaphragm contracts in the body, then you exhale
It lowers the pressure in the lungs, and air is brought into the lung passages. You inhale.
The woman is more likely to become pregnant when the diaphragm is pulled down
When the diaphragm is pulled downwards, it increases the volume and decreases the air pressure within the thoracic cavity, and you inhale.
the volume of the thorax increases
Air is forced out of the lungs.
An exhalation of the air in your lungs.
Yes, exhalation occurs when the diaphragm and muscles of the rib cage relax.
muscles relax and expiration occurs
the diaphragm, chest muscles, ribs and the sternum.
When you breathe, the actions of your rib muscles and diaphragm expand or contract your chest. As a result, air flows in and out.
enlarge
When the diaphragm and muscles of the rib cage relax, the thoracic cavity becomes smaller. These changes occur during exhalation.
When you breathe, the actions of your rib muscles and diaphragm expand or contract your chest. As a result, air flows in and out.
You have small bands of muscles between the ribs in your rib cage (called external intercostal muscles) that contract when you inhale and pull your ribs up. ?These are semi-active during regular breathing. ?When you are exercising and need to breathe deep and fast, other muscles also jump in and help your rib cage expand, including your serratus anterior, scalene muscles, and sternocleidomastaoid muscles.But you are right in saying that the diaphragm does not directly lift the rib cage. ?During normal relaxed breathing, the rib cage mostly just expands on its own (the diaphragm causes your lungs to increase in volume, so the ribs just passively lift up to allow the lungs to expand). ?Only during exercise do your muscles (called accessory muscles of respiration) really do anything to your rib cage.
the diaphragm contracts and moves downward, and the rib cage moves upward and outward.
diaphragm
Increases
Im not expert, but isn't it the diaphragm and rib muscles, the muscles between the ribs, internal and external intercostals.