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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16. What evidence do you have that diffusion occurs more rapidly under warmer conditions?

Transcribed Image Text:(molecular weight 158)
9.
What relationship exists between molecular weight and the rate of diffusion?hEdytHusgonaR
Ehe MoICculaR wei
bate S inveRsely teRoPORtonai with
Diffuslon and Molecular Size
10.
Observe all color changes in the practice test. Record your observations in the space below.
Glucose Test
Starch Test
Tube 1 - Starch + lz KI:
Tube 2 - Tap water + 12 KI
Tube 1- 1% glucose + Benedict's (heated):
Tube 2 - 0.1% glucose + Benedict's (heated):
Tube 3- Tap water + Benedict's (heated):l
On the basis of the indicator test for starch, what must have happened to the iodine molecules that
were originally only in the water in the large test tube?
11.
On the basis of the indicator test for glucose, what must have happened to the glucose molecules
that were originally in the cellulose tubing sac?
12.
13.
Did starch molecules diffuse out of the sac?
How do you know?
List the following in order of decreasing size: perforations in the sac, starch molecules, glucose
molecules.
14.
(largest)
(smallest)
Diffusion and Temperature
15.
Record your measurements of the colored areas in the space below.
At room temperature:
At freezing:
16. What evidence do you have that diffusion occurs more rapidly under warmer conditions?
17.
Muscle contractions which move the body depend heavily on diffusion. Why do we have difficulty
moving our fingers, etc. when they are cold?
Exercise 6, 5/13
6-7
Osmosis & Diffusion
Expert Solution

Step 1
Diffusion
Diffusion is the processes of mass transfer of individual molecule of a substance because of random molecular motion(Brownian motion) and associated with driving force such as concentration gradient.
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