Your fingers wrinkle in the water
BLACKDAY/Shutterstock Blood vessel constriction is to blame for making your fingers and toes look like prunes after you step out of the shower. As water starts to seep in your skin, the upper layers of the skin swell up. This water permeation causes the nerves in your skin to fire off electrical charges and chemicals, which make the blood vessels constrict. A negative pressure from your narrowed blood vessels pulls down the upper layers of your skin to create the wrinkles you see on your fingertips and toes. “Evolutionary experts are finding evidence that it may have actually helped humans to grip objects better when in water,” says Amy Rantala, MD, family medicine physician at Mayo Clinic Health System in Eau Claire, Wisconsin. “People who have nerve damage to their fingers or toes will often not have this same wrinkling of fingers.” Don’t miss these 14 bizarre bodily functions you just can’t control and the explanations behind them.
Your body jerks right before you fall asleep
lenetstan/Shutterstock An estimated 70 percent of people experience hypnic jerks on a regular basis, that feeling you get when your body suddenly jerks right before you fall into a deep sleep. Research hasn’t been able to pinpoint the exact reason behind the strange phenomenon, but there are a few theories circulating. One of them is that your muscle tone starts to shift as your breathing and heart rate start to slow down along with a body temperature decline, which causes these twitches during the transition. It could also be that the brain sends a signal to your muscles to tense up because it misinterprets the relaxation of your muscles as a sign that you’re falling. Check out these 10 strange body features you never knew existed on humans.