The result of this 2017 car accident was an absolute mess: the highway was littered with wriggling fish and coated in a thick slime that took the fire department 7 hours to clear.
Ginny had just emerged from the crowd, clutching a squirming Crookshanks, " Thanks, " said Hermione, relieving Ginny of the cat. " Come on, let's get a carriage together before they all fill up..."
The frequency and strength of these peristaltic waves varies, depending on how fast urine is being produced, and a series of valves prevent pee from backing up, making sure that instead it reaches the bladder.
20 Then God said, " Let the water teem with an abundance of living creatures, and on the earth let birds fly beneath the dome of the sky." And so it happened
The bolus is then moved by peristalsis through the esophagus and into the stomach, where hydrochloric acid is secreted and pepsin begins the digestion process.
Toxic metabolites also affect the autonomic nervous system regulating gastrointestinal motility, and this can causes abdominal pain, constipation, and vomiting.
This stage is called propulsion, and its initial mechanism is swallowing — which, as you know, is a voluntary action — but then it's quickly turned over to the involuntary process of peristalsis.
Together, they perform what's called peristalsis, which is a series of coordinated wave-like muscle contractions that helps squeeze the food bolus in one direction.
But most people also experience a few mass peristalsis movements a day — big, intense contractions that clear out a large swath of intestine at once, pushing feces into the rectum. These often occur just after eating.