suction
abdominal cavity
Protists do not have a body cavity.
Your question is not clear, but the diaphragm is the muscle that divided the abdomen from the thorax (the chest cavity from the abdominal cavity). Ventral is term that is used mostly in veterinary medicine and it refers to the side of the body that has the belly button.
thoracic cavity
cranial cavity
The embalming fluids used in the arteries and body cavity are essentially the same. The difference is the body fluid is slightly more acidic than the arterial fluid. It is also sometimes scented.
Catheter (Greek: to let down) is a flexible sterile tube inserted into a body cavity to introduce or withdraw fluid. Examples: intravenous catheter - can be used to withdraw blood or infuse medication/fluids. urethral catheter - tube inserted into the bladder to drain urine. cardiac catheter - visualization and treatment of coronary problems. toposcopic catheter - delivers chemotherapy to specific sites.
To remove fluid by suction with a needle is aspiration, which can be done through a centesis, which is a puncture of a body cavity.
The body fluids shift out of the blood vessels and into the interstitial space. These fluids are used for re-hydration.
The spinal cavity is involved in lumbar surgery.
abdominal cavity
There are several advantages to having a coelom, or body cavity. The organs are enclosed, there is independent movement of the body wall, there is more space for organs, and there is a storage area for sperm and eggs. It also has fluids that protect organs and provide nutrients.
Protists do not have a body cavity.
Pisces or fish have true internal body cavity.
Hypotonic Saline
This approach may be used when studying a specific organ within the body, such as the brain which is in the cranial cavity. As well as how the disease is affecting a number of different organs within the human body.
it depends on what the needle is being used for