Although it's rare to have one lung, as newly elected Pope Francis does, it shouldn't be a significant health issue for him now, experts say.
The pontiff, 76, had one of his lungs removed to treat an infection he had as a teenager, according to ABC News. At that time, it was more common to remove lungs to treat infections such as tuberculosis because antibiotics were not widely used.
Even today, complications of pneumonia and whooping cough are occasionally treated by surgically removing a lung, as are some cases of lung cancer, said Dr. Len Horovitz, pulmonologist at Lenox Hill Hospital in New York City.
When one lung is removed, the remaining lung inflates to take up some of the extra space. Living with one lung doesn't usually affect everyday tasks or life expectancy, though a person with one lung wouldn't be able to exercise as strenuously as a healthy person with two lungs, Horovitz said.
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An older person with one lung might be at increased risk for complications if they come down with pneumonia or another respiratory infection, ABC News reported, but there's not enough data to say this for sure.
Although you'd probably like to keep all your organs if you can, here are others you can live without:
Kidney: As you're probably aware, humans have two kidneys, but need only one to survive. People may be born with just one kidney, or have one removed after injury or for a donation. In general, people with one kidney have few or no health problems, and have a normal life expectancy, according to the National Kidney Foundation. Technically, people can live with no kidneys, but require dialysis.
Spleen: The spleen filters blood and helps the body fight infections, but it's not essential for survival. The spleen can be removed if, for instance, it's damaged. However, people without a spleen are more prone to infections.
Reproductive organs: Women can have their uterus removed in a hysterectomy as a treatment for cancer, uterine fibroids, chronic pelvic pain, or other reasons. About 1 in 3 women in the United States has had the procedure by age 60, according to the National Institutes of Health. Men may have their testicles removed as a treatment for testicular cancer.
Stomach: The whole stomach is sometimes removed as a treatment for stomach cancer, a procedure called a total gastrectomy. In this procedure, the small intestine is connected to the esophagus. People who've had a total gastrectomy receive nutrition through a vein for a few weeks while they recover. After that, they are able to eat most foods, but may need to eat smaller meals, and take dietary supplements if they have problems absorbing vitamins, according to the National Health Service of England.
Colon: People may have their colon removed as a way to treat colon cancer or Crohn's disease, or in some cases, to prevent colon cancer. People can live without a colon, but may need to wear a bag outside their body to collect stool. However, a surgical procedure can be performed to create a pouch in the small intestine that takes the place of the colon, and in this case, wearing a bag is not necessary, according to the Mayo Clinic.
Appendix: The appendix is a small, tube-shaped organ that juts out from the first part of the large intestine. It's unclear what its function is, but it can be removed if it becomes inflamed or ruptures.
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