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The Nervous System Agriculture Biology What is the nervous system composed of? • Brain • Spinal Cord • Nerves • Sense Organs • Receptors Fun facts first! What’s it made of? • 77% Water • 10-12% Lipids • 8% Protein • 1% Carbs • 2% Soluble Organics • 1% Inorganic Salt There are… • 100 Billion Neurons in the Human Brain About The same amount… • Of Stars in the Sky The left hemisphere has… • 186 million more neurons than the right hemisphere. 750-1000ml of blood flow… • through the brain every minute. • This is about 3 full soda cans! The brain can stay alive… • 4-6 minutes without oxygen! The slowest neurons in the brain… • travel at 260 MPH. • As “slow” as today’s fastest car! (Clocked at 253 MPH) More electrical impulses… • Are generated in one day by a single human brain than all the telephones in the world. The human brain has… • 70,000 thoughts in an average day. FUNCTIONS OF THE BRAIN (or noodle) Left vs. right • Logical • Creativity • Mathematical • Imagination • Linguistic • Speech • Artists • Dreamers • Visual Spatial How does the brain communicate with the rest of the body? neurons Sensory Neurons • Specialized to detect senses • Example: pressure or heat Motor neurons • Impulses that signal muscle contractions… motion. interneurons • Connect with other neurons.
