nerves

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6 09, 2017

Human organs: medieval science

By |2019-09-15T21:13:36-07:00September 6th, 2017|Biology, Science|0 Comments

Chinese drawing of the human organs (about 1200) Eyes and fevers Between the Middle Ages and modern times, doctors have learned a lot of new things about how human bodies work. Earlier history of the human body History of medicine History of science All our biology articles The Islamic doctor al-Tabari, in the early 800s, [...]

4 09, 2017

Medicine and doctors in the Roman Empire

By |2019-07-15T22:20:43-07:00September 4th, 2017|Romans, Science|1 Comment

Roman medicine: Galen used surgical instruments like these What do we mean by Roman medicine? Roman medicine is really West Asian and African medicine. That's because most of the great doctors of the Roman Empire lived in West Asia (in Turkey and Syria), or in Africa (in Egypt), not in Europe. Egyptian doctors [...]

16 08, 2017

What is electricity? Physics

By |2019-05-27T06:51:27-07:00August 16th, 2017|Physics|0 Comments

What is electricity? A bolt of lightning in the sky What is electricity made of? Everything in the universe is made of atoms.  Those atoms are made of electricity. Atoms are made of even smaller particles called protons, neutrons, and electrons. Electricity is electrons that have gotten loose from their atom. More about electrons History of electricity What [...]

27 05, 2017

Why do eyes have pupils?

By |2019-09-15T21:02:50-07:00May 27th, 2017|Biology|0 Comments

Cats have pupils that can get bigger or smaller. Eyes start to focus light By around 550 million years ago, some kinds of worms evolved eyespots sunk into their heads to protect them from being damaged. The origin of eyespots From eyespots to eyes Still the Proterozoic All our biology articles As a side effect, [...]

27 05, 2017

What are neurons? Nervous system evolution and biology

By |2017-05-27T15:24:43-07:00May 27th, 2017|Biology|0 Comments

A network of neurons One-celled creatures like bacteria don't have neurons, because they can communicate within themselves through the use of enzymes, but all multicellular animals do have neurons. The simplest and earliest example of neurons is in hydras, which evolved around 600 million years ago. In hydras, neurons are not organized into [...]

26 05, 2017

What is a brain? Biology and Evolution

By |2019-02-21T21:22:18-07:00May 26th, 2017|Biology|0 Comments

This is a mouse brain When did the first brains evolve? Flatworms were the first animals to evolve anything like a brain, but it's really just a thickened part of the main nerve at one end of the flatworm. That was about 550 million years ago, in the Proterozoic period. What is a [...]