EBK BIOLOGY
EBK BIOLOGY
10th Edition
ISBN: 8220100474729
Author: Martin
Publisher: Cengage Learning US
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Chapter 42.4, Problem 1C
Summary Introduction

To determine: The way in which human central nervous system (CNS) is protected.

Introduction: The central nervous system of the humans is a part of the nervous system which is comprised of the brain along with the spinal cord. The CNS acts as the central control unit of the nervous system in humans. In all human beings, it is very important to carefully protect the CNS. The human body is evolved in such a way to protect the components of the human CNS in a well-defined manner. Any kind of damage to the CNS can cause impaired functioning of the human body.

Summary Introduction

To determine: The functions of cerebrospinal fluid.

Introduction: Inside the bony protection, the brain and the spinal cord are covered by a triple layer of connective tissues, which is known as meninges. The three layers of the connective tissues include: the dura mater; the arachnoid; and the pia mater. Space between the arachnoid and the pia mater is called the subarachnoid space and contains the cerebrospinal fluid (CSF).

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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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