stomach

/Tag: stomach

History of the human body – doctors and science

By |2018-04-25T17:08:36-07:00September 6th, 2017|Science|

Ebers Papyrus, one of the oldest known medical texts. From Egypt, about 1550 BC Doctors have been trying to figure out how the human body works since the Stone Age, and there are still many things we don't know about the human body even today. Medical researchers all over the world have contributed bits [...]

What are segmented worms? Annelids, evolution, and biology

By |2019-01-27T20:52:49-07:00May 27th, 2017|Biology|

An annelid, or segmented worm When did annelids evolve? Roundworms probably evolved into segmented worms, or annelids, about 545 million years ago. What's a roundworm? More about the Proterozoic All our biology articles What were annelids like? The earliest annelids all lived in the ocean, as most kinds of annelid still do today. Some [...]

What does a stomach do? – Digestion and Evolution

By |2017-05-26T19:21:38-07:00May 26th, 2017|Biology|

Fish Stomach The first multi-cellular animals like hydras had no stomachs, or you could say they were all stomach, because they were shaped like a bag. Roundworms, a little later, were shaped like a tube, and the cells along that tube made mucus to protect the tube from the bacteria that digested food [...]

What are intestines? Evolution and Digestion

By |2017-09-17T09:06:21-07:00May 26th, 2017|Biology|

Whale intestines (from Medicine Chest) The first animals to have anything like an intestine evolved around 548 million years ago. These were roundworms, just a few millimeters long, and they had just a simple tube running from their mouth to their anus - no stomach in the middle. But already these roundworm guts [...]

Digestive System – Biology and Evolution

By |2019-05-07T20:07:23-07:00May 26th, 2017|Biology|

Digestive system: A hydra eating: the mouth is where all the tentacles come together,near the center of the picture.The hydra is eating the round bug in its stomach. Before digestive systems... Starting about 3.8 billion years ago, during the Archaean Era, one-celled creatures were the earliest living things. They just floated in the ocean [...]