Lab 14 The Urinary System BIO202L
Student Name:
Access Code (located on the lid of your lab kit): AC-AQW1GW
Lab Report Format Expectations
Utilize college level grammar and professional formatting when completing this worksheet.
Submissions without proper formatting, all required photos or sufficient responses will be rejected. Pre-
lab Questions
1. What is the function of the ureter?
The ureter is a thin tube responsible for carrying urine produced by the kidneys to the urinary
bladder, where it is stored until elimination.
2. Compare and contrast the male and female urethra.
In males, the urethra is a long tube that serves a dual role, allowing the passage of both urine
and semen out of the body. On the other hand, in females, the urethra is shorter and mainly
functions for urination.
3. Describe the two layers of the kidneys.
The renal cortex, situated on the kidney's outer layer, harbors nephrons that play a crucial role
in filtration. Meanwhile, the inner region, termed the renal medulla, aids in concentrating and
transporting urine.
,Lab 14 The Urinary System BIO202L
EXPERIMENT 1: KIDNEY FILTRATION
Introduction Questions
1. What specific part of the kidney does the dialysis tubing represent? What is this part’s function?
The dialysis tubing mimics the filtration mechanism observed in renal corpuscles, which consist
of the glomerulus and Bowman's capsule. In both cases, blood is filtered to produce a fluid
similar to urine.
2. What does the yellow food coloring represent at the end of the experiment? What does the
Congo Red represent?
The nephrons remove waste products from the bloodstream, represented by the yellow food
coloring, while the red food coloring is used to mimic the appearance of blood.
, Lab 14 The Urinary System BIO202L
Data and Observations
Record your observations as required by the experimental procedure in the table below.
Table 1: Solutions Present in Each Container Before 60 Minutes Submersion
Solution Dialysis Tubing Beaker
Congo Red yes no
Yellow Food Coloring yes no
Table 2: Solutions Present in Each Container After 60 Minutes Submersion
Solution Dialysis Tubing Beaker
Congo Red yes no
Yellow Food Coloring no yes
Results and Discussion
1. Why is it important that the kidney filters the blood? In your response, discuss what is being
removed and what is being selectively retained.
The kidney plays a vital role in purifying the blood by removing waste products and excess
water, while also maintaining the balance of fluids and electrolytes in the body.
Student Name:
Access Code (located on the lid of your lab kit): AC-AQW1GW
Lab Report Format Expectations
Utilize college level grammar and professional formatting when completing this worksheet.
Submissions without proper formatting, all required photos or sufficient responses will be rejected. Pre-
lab Questions
1. What is the function of the ureter?
The ureter is a thin tube responsible for carrying urine produced by the kidneys to the urinary
bladder, where it is stored until elimination.
2. Compare and contrast the male and female urethra.
In males, the urethra is a long tube that serves a dual role, allowing the passage of both urine
and semen out of the body. On the other hand, in females, the urethra is shorter and mainly
functions for urination.
3. Describe the two layers of the kidneys.
The renal cortex, situated on the kidney's outer layer, harbors nephrons that play a crucial role
in filtration. Meanwhile, the inner region, termed the renal medulla, aids in concentrating and
transporting urine.
,Lab 14 The Urinary System BIO202L
EXPERIMENT 1: KIDNEY FILTRATION
Introduction Questions
1. What specific part of the kidney does the dialysis tubing represent? What is this part’s function?
The dialysis tubing mimics the filtration mechanism observed in renal corpuscles, which consist
of the glomerulus and Bowman's capsule. In both cases, blood is filtered to produce a fluid
similar to urine.
2. What does the yellow food coloring represent at the end of the experiment? What does the
Congo Red represent?
The nephrons remove waste products from the bloodstream, represented by the yellow food
coloring, while the red food coloring is used to mimic the appearance of blood.
, Lab 14 The Urinary System BIO202L
Data and Observations
Record your observations as required by the experimental procedure in the table below.
Table 1: Solutions Present in Each Container Before 60 Minutes Submersion
Solution Dialysis Tubing Beaker
Congo Red yes no
Yellow Food Coloring yes no
Table 2: Solutions Present in Each Container After 60 Minutes Submersion
Solution Dialysis Tubing Beaker
Congo Red yes no
Yellow Food Coloring no yes
Results and Discussion
1. Why is it important that the kidney filters the blood? In your response, discuss what is being
removed and what is being selectively retained.
The kidney plays a vital role in purifying the blood by removing waste products and excess
water, while also maintaining the balance of fluids and electrolytes in the body.
