under what internal conditions does air tend to flow into the lungs?

Answer 1

In order for air to enter the lungs 2 things must happen.
1. The diaphragm must contract. This increases the volume ofthe thoracic cavity.

2. The intercostal muscles (rib muscles) will pull he ribs up and outward also increasing the cavity's volume.

Bothe of these will decrease the pressure inside the cavity and air will rush in from the outside.

Answer 2

To get air into our lungs, we have to create a system in which it is forced into our lungs by the laws of science. To do this, we have the diaphragm which is attached to the lungs. When it is tightened, it expands the volume of our lungs. Because air in our lungs is suddenly dispersed in a larger volume, there is a concentration gradient between the air outside our body and the air inside. This draws the air towards equillibrium, from the outside into our lungs. From there, it can go directly into the bloodstream.

Answer 3

The drawing and expulsion of air is pushed by employing muscular action; in early tetrapods, air replaced into pushed into the lungs by employing the pharyngeal muscle groups, while in reptiles, birds and mammals a greater complicated musculoskeletal equipment is used. interior the mammal, a huge muscle, the diaphragm (besides to the internal intercostal muscle groups), power ventilation by employing periodically changing the intra-thoracic quantity and tension; by employing increasing quantity and subsequently lowering tension, air flows into the airlines down a tension gradient, and by employing reducing quantity and increasing tension, the opposite happens. in the time of ordinary respiratory, expiration is passive and no muscle groups are shrunk (the diaphragm relaxes)

Answer 4

air flows into the lungs when there is less pressure inside the lungs than outside. this is caused by the contraction of the diaphram.