Worksheet Questions #1 TODO 1. The purpose of question 1 is to enable students to become familiar with diffusion times for different molecules and substances, and also to become familiar with diffusion coefficients (students should be careful to use diffusion coefficients with the correct units!) 1a. Fill in the numbers in the table Time to move 10 microns (typical size of animal cell) Object radius (nm) 0.2 0.5 1.4 oxygen sucrose insulin hemoglobin HIV bead bacteria ? 100 250 750 D 2*10-5 0.02 5*10-6 0.13 ? 0.3 7*10-7 0.2 •^~..c ? time (sec) ? ? 23 56 170 5 1b. What would be the appropriate units for the diffusion coefficient in this example? (2). 1c. What would be another set of units that might also apply to diffusion coefficients? 2. Cell Surface to Volume issues - this question asks students to become familiar with basic formulas used to calculate surface area and volume, and to understand how much surface area and volume change when the diameter of a cell (or organism) gets larger. It also gives practice in understanding the (confusing) concept of surface area to volume ratios. Finally, an important example of biological compensation for such matters is presented.
Worksheet Questions #1 TODO 1. The purpose of question 1 is to enable students to become familiar with diffusion times for different molecules and substances, and also to become familiar with diffusion coefficients (students should be careful to use diffusion coefficients with the correct units!) 1a. Fill in the numbers in the table Time to move 10 microns (typical size of animal cell) Object radius (nm) 0.2 0.5 1.4 oxygen sucrose insulin hemoglobin HIV bead bacteria ? 100 250 750 D 2*10-5 0.02 5*10-6 0.13 ? 0.3 7*10-7 0.2 •^~..c ? time (sec) ? ? 23 56 170 5 1b. What would be the appropriate units for the diffusion coefficient in this example? (2). 1c. What would be another set of units that might also apply to diffusion coefficients? 2. Cell Surface to Volume issues - this question asks students to become familiar with basic formulas used to calculate surface area and volume, and to understand how much surface area and volume change when the diameter of a cell (or organism) gets larger. It also gives practice in understanding the (confusing) concept of surface area to volume ratios. Finally, an important example of biological compensation for such matters is presented.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Physiology - question 1 a-c
Transcribed Image Text:Worksheet Questions #1
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1. The purpose of question 1 is to enable students to become familiar with diffusion
times for different molecules and substances, and also to become familiar with diffusion
coefficients (students should be careful to use diffusion coefficients with the correct
units!)
1a. Fill in the numbers in the table
Time to move 10 microns
(typical size of animal cell)
Object radius (nm)
oxygen
0.2
sucrose
0.5
insulin
1.4
hemoglobin
HIV
bead
bacteria
?
100
250
750
D
2*10-5 0.02
5*10-6 0.13
? 0.3
7*10-7 0.2
23
56
170
time (sec)
?
?
?
1b. What would be the appropriate units for the diffusion coefficient in this example?
(2).
1c. What would be another set of units that might also apply to diffusion coefficients?
2. Cell Surface to Volume issues - this question asks students to become familiar with
basic formulas used to calculate surface area and volume, and to understand how much
surface area and volume change when the diameter of a cell (or organism) gets larger.
It also gives practice in understanding the (confusing) concept of surface area to volume
ratios. Finally, an important example of biological compensation for such matters is
presented.
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