Anatomy & Physiology (6th Edition)
6th Edition
ISBN: 9780134156415
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Question
Chapter 1.4, Problem 3CYU
Summary Introduction
To review:
The reason for the given control system (for Figure refer to textbook) being called as the positive feedback mechanism, and the event that ends the mechanism.
Introduction:
The characteristic feature ofpositive feedback mechanisms is that the response generated from this system enhances the stimulus, which was initially formed. This process results in the acceleration of the response.
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A negative feedback system is one in which
a variable is changed in the same direction as the original change that initiated the system
the initiating variable is always reduced (made more negative)
a variable is changed in the opposite direction to the original change that initiated the system
two opposing variables are played against one other
the initiating variable is always increased (made more positive)
How can a malfunction in a negative feedback mechanism lead to the death of an organism?
A scientist at the University of Iowa uses a microscope to observe cells in the brain known as microglia. He makes observations about their structure, location, and activity. The scientist eventually observes the cells undergo a sudden and radical shift in their structure/shape and their motility (ability to move). He asks himself questions about what is causing this shift in behaviors and begins to design an experiment to determine the answer. Briefly describe how the scientist practiced both the exploration and testing aspects of scientific inquiry.
Chapter 1 Solutions
Anatomy & Physiology (6th Edition)
Ch. 1.1 - In what way does physiology depend on anatomy?Ch. 1.1 - Would you be studying anatomy or physiology if you...Ch. 1.2 - Prob. 3CYUCh. 1.2 - What is the correct structural order for the...Ch. 1.2 - Which organ system includes the bones and...Ch. 1.3 - What separates living beings from nonliving...Ch. 1.3 - Prob. 7CYUCh. 1.3 - Why is it necessary to be in a pressurized cabin...Ch. 1.4 - Prob. 1CYUCh. 1.4 - When we begin to get dehydrated, we usually get...
Ch. 1.4 - Prob. 3CYUCh. 1.5 - What is the anatomical position? Why is it...Ch. 1.5 - The axillary and acromial regions are both in the...Ch. 1.5 - What type of cut would separate the brain into...Ch. 1.6 - Prob. 1CYUCh. 1.6 - Of the uterus, small intestine, spinal cord, and...Ch. 1.6 - When you rub your cold hands together, the...Ch. 1 - The correct sequence of levels forming the...Ch. 1 - 2. The structural and functional unit of life is...Ch. 1 - Prob. 3MCCh. 1 - 4. Two of these organ systems bear the major...Ch. 1 - 5. In (a)-(e), a directional term [e.g., distal in...Ch. 1 - Prob. 6MCCh. 1 - Prob. 7MCCh. 1 - 8. Which of the following relationships is...Ch. 1 - Prob. 9MCCh. 1 - Prob. 10MCCh. 1 - 11. According to the principle of complementarity,...Ch. 1 - Prob. 12SAQCh. 1 - Prob. 13SAQCh. 1 - Prob. 14SAQCh. 1 - Prob. 15SAQCh. 1 - Prob. 16SAQCh. 1 - Define plane and section.Ch. 1 - Prob. 18SAQCh. 1 - Prob. 19SAQCh. 1 - 20. (a) Make a diagram showing the nine...
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