Organs Reflex
Cold diuresis
Being cold makes you need to urinate. The body pulls blood away from the skin into the core, the heart reads this as too much blood, and the kidneys are told to dump water.
Everyone
Internal organs
The gut, lungs, kidneys, bladder, and glands.
8 oddities. 5 have this as their primary region.
Organs Rare ability
Extraordinary breath-holding
Most adults can hold their breath for 30 to 90 seconds. Trained freedivers manage over 11 minutes, and over 24 minutes after breathing pure oxygen. One group of sea nomads has evolved larger spleens for diving.
Trained divers only
Organs Sound
Hiccups
A hiccup is a sudden jerk of the diaphragm followed by the voice box snapping shut. Everyone gets them, even before birth. The record case lasted 68 years.
Everyone
Mouth Involuntary
Inability to burp
Some people have never burped in their lives. Gas cannot pass a ring of muscle at the top of the food pipe, so it stays trapped. This causes gurgling, bloating, and painful pressure. Since 2019 it has a name and a treatment.
Unknown; probably uncommon
Nerves Involuntary
Pee shivers
A brief involuntary shudder during or just after urinating. Most men and many women get it. It is widely known and almost completely unstudied.
About 83% of men, 58% of women
Body Variation
Situs inversus
All the organs in the chest and belly sit on the opposite side from usual, as in a mirror. About 1 in 10,000 people are built this way, and most are healthy.
About 1 in 10,000 people
Organs Sound
Stomach growling
The rumble from your belly is gas and liquid being pushed through your gut by waves of muscle. It is louder when you are hungry because there is less food to muffle it.
Everyone
Organs Trick
Voluntary burping
Swallowing air on purpose and letting it back up as a belch. Most people can learn it. The loudest recorded burp is louder than a motorcycle.
Most people can learn it