BIOL 1101 Chapter Notes - Chapter 35: Central Nervous System, Spinal Nerve, Somatic Nervous System

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Nervous system= network of many interconnected nerve cells, allows an animal to sense and respond to environment + coordinate action of muscles + control internal function of body. Neuron= basic functional unit of nervous systems. What body features arose as adaptations for successful predation: cephalization= concentration of nervous system components at one end of the body (de ned as the front ), key feature of the body plan of most multicellular animals. Thought to be an adaptation for forward locomotion (allows animals to take in sensory info from the environment ahead of them as they move) Nearness of sensory organs to central ganglia= faster info processing. Allows animals to better detect and capture prey. Vertebrates: brain + many sense organs + mouth all located in the head, also evolved jaw + teeth + tongue to help in predation/food processing. !2: dendrites= receive signals from other nerve cells or from specialized sensory.

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