Question 1

Some species of fish that live in the cold waters of the Arctic Ocean have evolved an "antifreeze" protein. Why might this protein be important to homeostasis?

Accepted Answer

A)  The protein might be involved in transporting water into fish cells during cold weather. The more water in the cell, the smaller the chance that ice crystals will form. 
B)  The protein might prevent ice crystals from forming inside cells, which would prevent damage to the plasma membrane when temperatures are low. 
C)  The protein might be involved in removing solutes from fish cells during cold weather. With fewer solutes in the cell, essential chemical reactions are more likely to occur. 
D)  The protein might allow this species of fish to survive global warming by allowing it to carry out chemical reactions that would normally be prevented by warm temperatures.

Question 2

Which of the following is not a means used by chickadees to conserve heat in the winter?

Accepted Answer

A)  reducing convection 
B)  reducing radiation 
C)  reducing metabolism 
D)  reducing evaporation

Question 3

Secretion and ____________ take place in the U-shaped kidney tubule.

Accepted Answer

The answer of Secretion and ____________ take place in the...

Question 4

During the day, camels allow their body temperature to rise to up to 40.5°C. At night, their temperature drops back to normal as a result of __________ when the air temperature drops below the camel's body temperature.

Accepted Answer

The answer of During the day, camels allow their body...

Question 5

Cooling by evaporation requires

Accepted Answer

A)  radiation. 
B)  a dried surface. 
C)  a wet surface. 
D)  conduction.

Question 6

Which of the following is not reabsorbed as the filtrate from the glomerulus moves through the nephron?

Accepted Answer

A)  urea 
B)  glucose 
C)  water 
D)  creatinine

Exam 20: Maintaining the Internal Environment