You can breathe with a hole in your pleural sac if the hole remains small. The hole will make breathing less efficient and air will escape from the pleural lining into other parts of they body, but one can breathe.
the pleural sac or pleural membrane maintains the negative pressure that is in your lungs. negative pressure inside the lungs is very important since it allows atmospheric air to enter your lungs each time you inhale, much like a suction. the pleural sac also allows your lungs to expand easily since it contains a lubricant called pleural fluid.
aveoli sac
Pleural fluid is present in the pleural sac. This fluid act as a lubricant and minimizes the friction between outer and inner layer of pleura, during respiration.
No
The hole must be covered as soon as possible. Otherwise, the air enters to the pleural cavity.
All insects breathe through their skin.
The pleural membranes are thin, double-layered membranes that surround the lungs and line the chest cavity. They help create a sealed sac around the lungs, allowing them to expand and contract during breathing without friction. This separation creates a negative pressure within the pleural cavity, which helps in the process of respiration.
They use a blow hole to breathe in/out air when the surface the water.
They breathe through the blow hole on the top of their heads
This is the birth sac that needs to be removed so the baby can start to breathe. If you are talking about the sac that shows on an ultrasound, this is the amniotic sac that contains the 'waters' and is absolutely necessary for the growth of the baby. It is the same thing that the answer above mentions.
they have spiricals which is hole that help them breathe
No they do not. Most can however breathe through both their skin when wet and lungs.