MSU BIO215 Lecture - Week 11 Objective Assignment

MSU BIO215 Lecture - Week 11 Objective Assignment - BIOL215...

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BIOL215 Lecture Week 11 Objective Assignment Chapter 11: Fundamentals of the Nervous System and Nervous Tissue Functions and Divisions of the Nervous System 1. Explain the structural and functional division of the nervous system. The nervous system has three overlapping functions: Sensory input, integration, and motor output. It can be divided into two principal parts the CNS and the PNS. The CNS consists of the brain and spinal cord and it interprets sensory input and dictates motor responses based on reflexes, current conditions, and past experiences. The PNS consists mainly of the nerves that extend from the brain and spinal cord and has two functional subdivisions the sensory (afferent) division that consists of nerve fibers that convey impulses to the CNS, and the motor (efferent) division that transmits impulses from the CNS to the effector organs and bring about a motor response. The motor division also has two divisions the somatic nervous system, which is often referred to as the voluntary nervous systems because it allows us consciously to control skeletal muscles and movement, and the autonomic nervous system, which regulates the activity of both smooth and cardiac muscle and glands, and is generally not controlled, and often referred to as the involuntary nervous system. The autonomic nervous systems further branches into the sympathetic division, which mobilizes body systems during activity, and the parasympathetic division, which conserves energy and promotes house-keeping functions during rest. Histology of the nervous system 1. Define neuron, describe its important structural components, and relate each to a functional role. A neuron is an excitable nerve cell that transmits electrical signals, having extreme longevity, is amitotic, and has exceptionally high metabolic rates and requires continuous and abundant supplies of oxygen and glucose. Neurons cannot survive for more than a few minutes without oxygen. Neurons are large complex cells that have three basic parts:
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MSU BIO215 Lecture - Week 11 Objective Assignment - BIOL215...

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