3-4-08 notes

3-4-08 notes - March 4, 2008 NERVOUS SYSTEM (CHAPTER 8)...

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Unformatted text preview: March 4, 2008 NERVOUS SYSTEM (CHAPTER 8) Themes Active vs. Passive Transport across membranes Diffusion across Concentration Gradients Highly specific receptor-mediated responses CQ: Epinephrine can: A) Cause vessel dilation B) Cause vessel constriction C) Can stimulate the release of glucose from the liver D) A and B E) A, B, and C Endocrine disruptors Endocrine disruptors o Natural or synthetic compounds o Interfere with normal endocrine function o Widespread in the environment Potent at LOW concentrations Effects in humans and animals How do the Endocrine and Nervous Systems Differ? Hormones o More slowly acting o Control of things that change over long time periods (minutes to years) o Specialized glands o Travel throughout bloodstream o Examples Growth Reproduction Neurotransmitters o Rapid acting o Control over short time periods (seconds to minutes) o Released by neurons o Cross synapses o Examples Heart rate Respiration Voluntary muscle contractions What does the nervous system do? Fundamental challenges o Coordination Sensory system Response to stimuli o Integration of bodily functions Responsible for what we think, feel, how we behave Nervous System 1) Central Nervous System a. Brain b. Spinal cord Integrated info that is taken in internally and externally 2) Peripheral Nervous System a. Everything elsecranial nerves & spinal nerves Carries out commands from the central nervous system Peripheral Nervous System Somatic Nervous System o Skeletal muscles o Voluntary movements o Coordinated info that is taken in and coordinated the action of your skeletal muscles Autonomic Nervous System o Internal environment o Involuntary movements How muscles move a bolus of food through your digestive tract o Coordinated info that I received internally o Helps regulate your internal environment o 3 classes Sympathetic Nervous System Flight or flight How your body responds to new things Ex. Pupil dilation, accelerated heart beat, adrenal medulla...
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3-4-08 notes - March 4, 2008 NERVOUS SYSTEM (CHAPTER 8)...

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