Homeostasis Lab
Part I: Liver
Table 1: Blood Glucose Levels After Eating
Test tubes in order of color change (which
changed 1st, 2nd, and 3rd)
Source of Serum (did it come from a
mesenteric artery, hepatic portal vein, or
hepatic vein?)
B1
hepatic portal vein
C1
hepatic vein
A1
mesenteric artery
Questions
1. Which blood vessel, the mesentery artery, the hepatic portal vein, or the hepatic vein
contains the most glucose after eating? ​hepatic portal vein
2. Explain why the hepatic portal vein contains more glucose than the hepatic vein after
eating.​ It grabs the sugar from what you just ate and transports it to the liver after
eating.
Table 2: Blood Glucose Levels Before Eating
Test tubes in order of color change (which
changed 1st, 2nd, and 3rd)
Source of Serum (did it come from a
mesenteric artery, hepatic portal vein, or
hepatic vein?)
C2
hepatic vein
A2
mesenteric artery
B2
hepatic portal vein
Questions
1. Which blood vessel, the mesentery artery, the hepatic portal vein, or the hepatic vein
contains the most glucose before eating?​ Hepatic vein
2. Explain why the hepatic portal vein contains less glucose than the hepatic vein before
eating. ​You haven’t eaten anything so there is nothing to absorb.
Part II: Kidneys
Questions
1. Which parts of the nephron are located in the renal cortex?​ Distal Tubule, Glomerulus,
Proximal Tubule
2. Which components of the nephron are located in the medulla? ​Collecting Duct and
Loop of Henle
Table 3: Focus on Filtration
Substance
Enter Bowman’s Capsule?
Why
Glucose
Yes
Small
Cells
No
Too big
Proteins
No
Too big
Amino acids
Yes
Small
Salts
Yes
Small
Urea
Yes
Small
Water
Yes
Small
Questions
1. What would happen to the blood volume over time if water were not reabsorbed?​ It
would get low
2. How would this lack of water reabsorption affect blood pressure? ​It would not be as
leaky
3. Fill in the table below indicating which molecules will be reabsorbed into the blood
Table 4: Focus on Reabsorption
Substance
Reabsorbed?
Why?
Glucose
Yes
Need it
Amino acids
Yes
Need them
Salts
Yes
Maintain Ph and blood
volume
Urea
Yes
Secreted
Water
Yes
Maintain Ph and blood
volume
Table 5: Osmoregulation
Event
Change in blood ADH output
concentration
Water
Reabsorption
Type of Urine
produced
Dehydration
due to
sunbathing in
the afternoon
and forgetting
your water
bottle
Increase
Increase
Increase
Scant,
concentrated
Drinking large
amounts of
water
throughout the
day
Decrease
Decrease
Decrease
Copious, dilute
Going to the
movie theater
and eating a
large bucket of
salty popcorn
without water to
wash it down
Increase
Increase
Increase
Scant,
concentrated
Questions
1. If the blood is more basic than normal, what pH do you think the urine will be? ​basic
2. If the blood is more acidic than normal, what pH do you think the urine will be? ​acidic