Anatomy and Physiology: Alimentary Tract Functions
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Questions and Answers

What is the approximate length of individual smooth muscle fibers in the gastrointestinal tract?

  • 500-800 micrometers
  • 100-200 micrometers
  • 200-500 micrometers (correct)
  • 800-1000 micrometers

What is the approximate diameter of individual smooth muscle fibers in the gastrointestinal tract?

  • 1-5 micrometers
  • 10-15 micrometers
  • 2-10 micrometers (correct)
  • 15-20 micrometers

What allows low-resistance movement of ions from one smooth muscle cell to the next within each bundle?

  • Tight junctions
  • Desmosomes
  • Gap junctions (correct)
  • Hemidesmosomes

What characterizes the electrical activity of the smooth muscle in the gastrointestinal tract?

<p>Slow waves and spikes (B)</p> Signup and view all the answers

How does electrical excitation of one muscle layer in the gastrointestinal tract typically affect the other?

<p>Excitation of the other layer (B)</p> Signup and view all the answers

What is the approximate number of red blood cells in each person?

<p>25 billion (A)</p> Signup and view all the answers

What is the main focus of the book mentioned in the text?

<p>Studying the coordination of control systems in the human body (D)</p> Signup and view all the answers

What do all cells deliver into the surrounding fluids?

<p>Products of chemical reactions (D)</p> Signup and view all the answers

What is the main role of microbiota in the human body?

<p>Living in harmony with human hosts (C)</p> Signup and view all the answers

What is pathophysiology primarily concerned with?

<p>Disordered body function (A)</p> Signup and view all the answers

What is the main focus of physiology?

<p>Understanding the physical and chemical mechanisms responsible for the origin and development of life (C)</p> Signup and view all the answers

Why do humans seek food when hungry and refuge when afraid?

<p>Due to automatic life sequence (A)</p> Signup and view all the answers

How does human physiology contribute to medicine?

<p>By integrating multiple functions of cells, tissues, and organs into the functions of the living human being (A)</p> Signup and view all the answers

What allows humans to exist under widely varying conditions?

<p>Sensing, feeling, and knowledgeable beings (C)</p> Signup and view all the answers

Why does the science of physiology have numerous subdivisions?

<p>Each type of life has its own functional characteristics (B)</p> Signup and view all the answers

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