digestion

Home/Tag: digestion
3 06, 2017

Digestion – Oxidation reaction

By |2019-05-08T05:40:43-07:00June 3rd, 2017|Biology, Chemistry|2 Comments

Kids eating food (thanks to USDA) - get ready to digest food! How do you digest food? When animals, including people like you, digest their food, they use an oxidation reaction to break down big hydrocarbon molecules like sugar into different molecules. Cell digestion Digestive system What is an oxidation reaction? All our chemistry articles [...]

28 05, 2017

Enzymes project – Bread and Spit – Science Activities -Biology

By |2017-05-28T17:33:50-07:00May 28th, 2017|Biology, Food|0 Comments

A loaf of bread You can easily taste how your enzymes work breaking down your food into smaller pieces. Do this experiment right after lunch, when you'll have a lot of enzymes in your saliva. Get a slice of plain bread (a starch) and chew it slowly. Keep chewing for a long time, but [...]

28 05, 2017

Cell digestion – Parts of a cell – Cell Biology

By |2019-05-07T14:54:58-07:00May 28th, 2017|Biology|0 Comments

Amoeba - a one-celled organism - Cell digestion How do cells get energy? All cells have to have some way to get energy from outside themselves, or they will starve to death. The earliest, simplest cells, about 3.5 billion years ago, got their food by drifting around in the ocean until they came [...]

28 05, 2017

What is a hydra? Animal Biology and Evolution

By |2019-09-05T15:21:51-07:00May 28th, 2017|Biology|0 Comments

Hydra evolution: a hydra budding new hydras Before the hydra For almost three billion years, the only living things on earth were one-celled creatures, either prokaryotes or eukaryotes. What's a prokaryote? And a eukaryote? All our biology articles Early multi-cellular creatures Even today, the vast majority of the living things on earth are one-celled creatures [...]

26 05, 2017

What does a stomach do? – Digestion and Evolution

By |2017-05-26T19:21:38-07:00May 26th, 2017|Biology|0 Comments

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 [...]

26 05, 2017

What does my liver do? Evolution and Digestion

By |2017-05-26T18:01:56-07:00May 26th, 2017|Biology|0 Comments

Fish liver The earliest beginnings of what became the liver may have been relatives of segmented worms that lived about 600 million years ago. These worms evolved to have sections of their intestines that pinched out and made two little bags. Probably the worms used the bags to keep extra fat in, for when [...]

26 05, 2017

What are intestines? Evolution and Digestion

By |2019-09-21T15:05:41-07:00May 26th, 2017|Biology|0 Comments

Whale intestines (from Medicine Chest) When did intestines evolve? The first animals to have anything like an intestine evolved around 548 million years ago. These were roundworms, just a few millimeters long. Roundworms had just a simple tube running from their mouth to their anus - no stomach in the middle. What's a [...]

26 05, 2017

Digestive System – Biology and Evolution

By |2019-05-07T20:07:23-07:00May 26th, 2017|Biology|0 Comments

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 [...]