7.01 Nervous and Endocrine Systems.rtf - Biology Notebook...

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Biology Notebook: 07.01 Nervous and Endocrine Systems Objectives: Explain how the two parts of the nervous system work together Identify the major parts of the brain Describe the structure and function of the central and peripheral nervous systems Explain the connection between the nervous system and the endocrine system Key Questions and Terms Notes Nervous and Endocrine Systems What are the two major systems if internal communication in our bodies? The nervous stems and the endocrine system How do the nervous and endocrine systems send messages differently? The nervous system sends high-speed electrical signals along pathways of specialized cells. the chemical messages of the endocrine are spread in a slower nature, but still very important The Nervous System What is the main function of the nervous system? It takes information about the body’s internal and external environment, processes that information, and responds to it. What is the nervous system made up of? An intricate series od neurons that send and process signals through the body What is a neuron? A nerve cell, the fundamental unit of the nervous system that conducts electrical signals through the body. What are neural pathways? They send and receive information that controls our movement, perceptions, thoughts, and memory What are the two main categories of the nervous system? Central nervous system and peripheral nervous system What are the two parts of the central nervous system? Brain and spinal cord What are the parts of the peripheral nervous system? Motor (efferent) neurons and sensory (afferent) neurons Neurons Describe the following parts of a neuron: Cell body Dendrites Axon Axon Terminal Nerve Cell body : the largest part of the neuron. It contains the nucleus, other organelles, and most of all, the cytoplasm Dendrites : short, branched extensions that spread out from the cell body. One neuron may have dozens of dendrites, which receive impulses from other neurons and carry those
impulses into the cell body. Axon : a long, branching extension that carries impulses away from the neuron’s cell body to other neurons. Axon Terminal : the end, or terminal, of the axon contains tiny vesicles filled with neurotransmitters, chemicals that transmit an impulse from the axon of one neuron to the dendrites of a neighboring neuron. Nerves : dendrites and axons from more than one neuron will often combine together and form bundles called nerves. Some nerves may be made up of a few neurons while others may be bundles of hundreds or thousands of neurons. Draw and label neuron. Nervous System Form and Function What are the two categories of neuron functions? Transmitting signals and processing signals What are the functions of sensory and motor neurons?

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