Explanation Explanation for the correct answers: Option (b) , contraction of the dilator pupillae muscles, is the correct answer. The dilator papillae muscles contain a spoke-like organization of modified contractile cells named as myoepithelial cells. SNS stimulates these cells. In dim light and distant vision, these muscles contract and pupil dilation occurs. This pupillary dilation is controlled by sympathetic fibers. So, option (b) is correct. Explanation for the incorrect answers: Option (a), contraction of the sphincter pupillae muscles, is an incorrect answer. In bright light and close vision, sphincter pupillae, which are circular muscles, contract, and pupil gets constricted. This pupillary constriction is controlled by parasympathetic fibers. Hence, option (a) is incorrect. Option (c), contraction of the ciliary muscles, is an incorrect answer...

6th Edition

ISBN: 9780134156415

Author: Elaine N. Marieb, Katja N. Hoehn

Publisher: PEARSON

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Question

Chapter 13, Problem 11MC

Summary Introduction

Introduction:

SNS (sympathetic nervous system) represents one of the divisions of ANS (autonomic nervous system), which possesses a primary role of stimulating the body’s fight-or-flight response. However, fibers from this system innervate tissues in around every organ system, regulating at least some functions, like gut motility, urinary system output and function, and pupil diameter.

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Chapter 13, Problem 10MC

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Chapter 13 Solutions

Anatomy & Physiology (6th Edition)

Ch. 13.1 - What are the three levels of sensory integration?Ch. 13.1 - Prob. 2CYU Ch. 13.1 - Your cortex decodes incoming action potentials...Ch. 13.2 - Your PNS mostly consists of nerves. What else...Ch. 13.2 - Youve cut your finger on a broken beaker in your...Ch. 13.4 - What are tears and what structure secretes them?Ch. 13.4 - Prob. 5CYU Ch. 13.4 - Arrange the following in the order that light...Ch. 13.4 - You have been reading this book text for a while...Ch. 13.4 - Prob. 8CYU

Ch. 13.4 - For each of the following, indicate whether it...Ch. 13.4 - Which part of the visual field would be affected...Ch. 13.4 - Prob. 13CYU Ch. 13.4 - Name the five taste modalities. Name the three...Ch. 13.5 - Apart from the bony boundaries, which structure...Ch. 13.5 - Which structure inside the spiral organ allows us...Ch. 13.5 - Prob. 17CYU Ch. 13.5 - If the brain stem did not receive input from both...Ch. 13.5 - Prob. 19CYU Ch. 13.6 - Prob. 20CYU Ch. 13.6 - What is in a nerve besides axons?Ch. 13.6 - Wills femoral nerve was crushed while clinicians...Ch. 13.7 - Name the cranial nerve(s) most involved in each of...Ch. 13.8 - Prob. 24CYU Ch. 13.8 - After his horse-riding accident, the actor...Ch. 13.9 - What are varicosities and where would you find...Ch. 13.10 - Which parts of the nervous system ultimately plan...Ch. 13.11 - Prob. 28CYU Ch. 13.11 - Prob. 29CYU Ch. 13.11 - Prob. 30CYU Ch. 13.11 - Prob. 31CYU Ch. 13 - The large onion-shaped receptors that are found...Ch. 13 - Proprioceptors include all of the following except...Ch. 13 - Prob. 3MC Ch. 13 - Prob. 5MC Ch. 13 - For each of the following muscles or body regions,...Ch. 13 - Prob. 33MC Ch. 13 - Prob. 4MC Ch. 13 - Match the names of the cranial nerves in column B...Ch. 13 - Prob. 8MC Ch. 13 - The portion of the fibrous layer that is white and...Ch. 13 - Which sequence best describes a normal route for...Ch. 13 - Prob. 11MC Ch. 13 - Damage to the medial recti muscles would probably...Ch. 13 - The phenomenon of dark adaptation is best...Ch. 13 - Blockage of the scleral venous sinus might result...Ch. 13 - Nearsightedness is more properly called a. myopia,...Ch. 13 - Of the neurons in the retina, the axons of which...Ch. 13 - Which reactions occur when a person looks at a...Ch. 13 - The blind spot of the eye is a. where more rods...Ch. 13 - Olfactory tract damage would probably affect your...Ch. 13 - Sensory impulses transmitted over the facial,...Ch. 13 - Taste buds are found on the a. anterior part of...Ch. 13 - Gustatory epithelial cells are stimulated by a....Ch. 13 - Olfactory nerve filaments are found a. in the...Ch. 13 - Conduction of sound from the middle ear to the...Ch. 13 - Which of the following statements does not...Ch. 13 - Pitch is to frequency of sound as loudness is to...Ch. 13 - The structure that allows pressure in the middle...Ch. 13 - Which of the following is important in maintaining...Ch. 13 - Equilibrium receptors that report the position of...Ch. 13 - Which of the following is not a possible cause of...Ch. 13 - Which of the following are intrinsic eye muscles?...Ch. 13 - Prob. 32MC Ch. 13 - List the structural components of the peripheral...Ch. 13 - Prob. 47SAQ Ch. 13 - Central pattern generators (CPGs) are found at the...Ch. 13 - Prob. 48SAQ Ch. 13 - Explain how a crossed-extensor reflex exemplifies...Ch. 13 - What clinical information can be gained by...Ch. 13 - Prob. 46SAQ Ch. 13 - How do rods and cones differ functionally?Ch. 13 - Where is the fovea centralis, and why is it...Ch. 13 - Prob. 37SAQ Ch. 13 - Since there are only three types of cones, how can...Ch. 13 - Where are the olfactory sensory neurons, and why...Ch. 13 - (a) Define plexus. (b) Indicate the spinal roots...Ch. 13 - What is the homeostatic value of flexor reflexes?Ch. 13 - Prob. 43SAQ Ch. 13 - Prob. 1CCS Ch. 13 - Prob. 2CCS Ch. 13 - Prob. 3CCS Ch. 13 - Prob. 1CCSS Ch. 13 - Prob. 2CCSS Ch. 13 - Prob. 3CCSS Ch. 13 - Prob. 4CCSS Ch. 13 - Prob. 5CCSS

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Solution Summary: The author explains that the sympathetic nervous system stimulates the body's fight-or-flight response, but fibers innervate tissues in around every organ system, regulating at least some functions.

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