Chapter 49: Nervous Systems
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1 AP Biology Reading Guide Fred and Theresa Holtzclaw Chapter 49 Nervous Systems Name Period Chapter 49: Nervous Systems Concept 49.1 Nervous systems consist of circuits of neurons and supporting cells 1. This concept begins with a look at the evolution of nervous systems. You will want to study this to tie in with your study of animal diversity. To master this concept, you will need to be solid in the vocabulary that is used here. Begin by defining these terms: nerve net nerve cephalization ganglia 2. For the animals sketched below, give the common name of the organism and its phylum. Also note the important features of its nervous system. Copyright 2010 Pearson Education, Inc.
2 AP Biology Reading Guide Fred and Theresa Holtzclaw Chapter 49 Nervous Systems 3. Which phylum has a nerve net? is the first phylum to show cephalization? has a ventral nerve cord? a dorsal nerve cord? 4. What are the two components of the central nervous system? 5. A reflex is the body s automatic response to certain stimuli. Give two examples of reflex responses. 6. A reflex arc is illustrated and explained in Figure It is important for you to understand this pathway, so take some time with the figure below. Label the following: stimulus, receptors (sensors), sensory neuron, interneuron, spinal cord, gray matter, white matter, motor neuron, effector (muscle). 7. What is the function of cerebrospinal fluid in mammals? Where is it found? Copyright 2010 Pearson Education, Inc.
3 AP Biology Reading Guide Fred and Theresa Holtzclaw Chapter 49 Nervous Systems 8. Distinguish between white matter and gray matter. 9. Neurons conduct nerve impulses. What are the specialized support cells that have other functions, including myelination, structural support, and protection? 10. What makes up the peripheral nervous system (PNS)? What is the function of the PNS? 11. Go back to the figure in question 6, and correctly label the afferent and efferent neurons. 12. Figure 49.7 shows the branches of the peripheral nervous system. Label these branches. Which branch is sometimes called the voluntary nervous system? Which one is often termed involuntary? Include these terms on the diagram below. 13. What would be the effect of stimulation by the sympathetic nervous system on heart rate? What would be the effect of stimulation by the parasympathetic nervous system on peristalsis? 14. Concept Check Question 1 in your text asks: Which division of your autonomic nervous system would likely be activated if you learned that an exam you had forgotten about would start in 5 minutes? Explain your answer. Copyright 2010 Pearson Education, Inc.
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5 19. What are the 3 main functions of a skeleton? 20. How does a hydrostatic skeleton work? What evolutionary advantages might such a skeleton provide? 21. Distinguish between an exoskeleton and endoskeleton, giving an example of each type in your descriptions. 22. What does it mean that muscles are arranged in antagonistic pairs? If this is the case, can you flex both members of the pair simultaneously? What happens? 23. What is the hierarchical breakdown of muscle anatomy? Muscle Fascicle Label each part of the sarcomere below. Which regions shorten during a muscular contraction? Which regions stay the same length? 25. Explain the sliding filament theory of muscle contraction. This is a very popular topic on previous AP exams so understanding the details is ideal.
6 26. Explain the role of calcium, troponin and tropomyosin in muscle contraction. 27. Label the following image and identify what is occurring at each major point.
7 28. We used to think that being poisoned by Botulism toxin was a bad thing. Not anymore! How to does botox work (details!) to minimize lines? 29. Explain how muscular contraction is the result of multiple twitches that sum together, and how this promotes smooth contractions rather than jerky ones. 30. Compare and contrast the 3 muscle fiber types: Slow oxidative, fast oxidative, fast glycolytic. 31. Compare and contrast the 3 muscle types smooth, skeletal and cardiac.
Nervous systems consist of circuits of neurons and supporting cells. [2]
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