Biology: The Dynamic Science
Biology: The Dynamic Science
4th Edition
ISBN: 9781337246422
Author: Peter J. Russell; Paul E. Hertz; Beverly McMillan
Publisher: Cengage Learning US
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Chapter 47.2, Problem 2SB
Summary Introduction

To review:

The five food processing steps that occur in a digestive tube.

Introduction:

In all vertebrates and most invertebrates, digestion occurs outside the cells in a pouch or tube with the help of enzymes secreted by the epithelial cells. The digestive tract is a tube-like structure, whose one opening forms the mouth while the other forms the anus. It is also called a digestive tube, alimentary canal, or gastrointestinal tract. The inside of the tube is known as the lumen.

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After you feel comfortable with your counting method and identifying cells in the various stages of mitosis, use the four images below of whitefish blastula to count the cells in each stage until you reach 100 total cells, recording your data below in Data Table 1. (You may not need to use all four images. Stop counting when you reach 100 total cells.) After totaling the cells in each stage, calculate the percent of cells in each stage. (Divide total of stage by overall total of 100 and then multiply by 100 to obtain percentage.)   Data Table 1Stage    Totals    PercentInterphase        Mitosis:        Prophase        Metaphase        Anaphase        Telophase        Cytokinesis        Totals    100    100% To find the length of time whitefish blastula cells spend in each stage, multiply the percent (recorded as a decimal, in other words take the percent number and divide by 100) by 24 hours. (Example: If percent is 20%, then Time in Hours = .2 * 24 = 4.8) Record your data in Data…
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Human digestive system - How it works! (Animation); Author: Thomas Schwenke;https://www.youtube.com/watch?v=X3TAROotFfM;License: Standard Youtube License