The+Brain

=The Brain = The brain controls the body temperature, blood pressure, heart rate and breathing. It accepts a flood of information about the world around you from your various senses. It handles physical motion when walking, talking, standing or sitting. The brain lets you think, dream, reason and experience emotions. The brain functions by communicating between cells through branches called dendrites. When you learn something, your dendrites activate by helping you remember what you learned, this is called synapsis. The simplest creatures have incredibly simple nervous systems made up of nothing but reflex pathways. Your brain is about the size of a head of cauliflower. It is made of approximately 100 billion nerve cells, called neurons. Neurons gather and transmit electrochemical signals. Neurons share the same characteristics as other cells, but they can pass messages to other neurons a few feet away! The simplest creatures have very simple nervous systems made of only reflex pathways. For example, flatworms do not have a centralized brain. Flatworms have neural nets. A neural net is individual neurons linked together and they form a net around the entire animal. Most invertebraes have simple brains. They are made of localized collections of neuronal cell bodies called ganglia. Each ganglia controls sensory and motor function through the reflex pathways. The ganglia are linked together and form a simple nervous system. As nervous systems evolved, chains of ganglia evolved into more centralized simple brains.

When you use your senses, your nerves send a message to your brain, your brain then sends out another message back out through your nerves, and to your body and then a reaction occurs (ex: moving your hand off a hot plate). This all happens super fast.



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