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Neurons. Do Now. Do Now How does this relate to the Nervous System?. Homework Due Today. Read Section 31.1 Answer question 1-3 on page 900. Homework. Describe the function of the nervous system?
Neurons. Vary in size and structure, but have common features: Cell Body Dendrites Axon Mature neurons do not divide, but neural stem cells can divide and form neurons or neuroglial cells. 1. Cell Body.
Neurons. The fundamental neural circuit element Neurons come in many Shapes and sizes. Information flow in neuronal circuits is into dendrites. and then to the soma . and then through axons. to synapses. and onto the next cell. Therefore Information flow is directional.
Neurons. The two principal cell types of the nervous system are: Neurons – excitable cells that transmit electrical signals. There are 150 different types. Vary in function and size. Supporting cells (neural glia)– cells that surround and wrap neurons.
Neurons. Neurons. Definition: An individual nerve cell 100 billion neurons make up the brain Neurons link to each other in tight clusters and long “chains” Millions of neurons must send messages at the same time to produce a single thought.
Neurons. The human brain. Thought experiment. Scientist have discovered that the brain has about 83 billion neurons. How do they know?. General Morphology of a Neuron. Axon Hillock. Nodes of Ranvier. Biology of a Neuron. Neurons are Diverse. Neurons Can be Classified by Morphology.
Neurons. What is a neuron?. A nerve cell that is the building block of the cell. Similar to cell but one key difference. Neurons are specialized to transmit information through the body. . Differences. Neurons stop reproducing shortly after birth.
Neurons. Ch 48. Function of the Nervous System. sensory input. motor input. sensory receptor. effector. integration. Anatomical Divisions of the Nervous System. Central Nervous System (CNS) brain spinal cord Peripheral Nervous System (PNS) cranial nerves spinal nerves. Neuroglia.
Neurons. Functional Organization of Neurons. Input zone (dendrites). Transmission zone (axon). Output zone (synapses). The Resting Potential. Almost all cells have a transmembrane electrical charge difference, with the inside roughly 50-100 mV negative relative to the outside.