BIO304H5 Lecture Notes - Lecture 1: Heart Rate, Exocytosis, Retina
Document Summary
2 term tests - worth 25% each. The system of the body which works to conduct signals. System of nerve cells which is unique to animals. Not really because many organism"s don"t have a brain but still have a nervous system. Don"t have brains but have simple nervous systems which do everything that a brain is required for in humans. Many invertebrates lack brains (centralized nervous systems) They have nerve nets which are able to compute information about the outside world and generate behaviour. Hydra - nervous system has an overlapping neural network which makes it light up - created by scientists with a gene. Scientists created a hydra whose nerves glow when a neuron is fired. Even bacteria and plant cells can fire impulses like action potentials to propagate information. Can"t say a neuron is purely an excitable cell for animals. Sits of cell to cell contact that permit excitable cells to communicate.
