Question 1

Which of the following statements about proteases is correct in the context of animal digestion?

Accepted Answer

Proteases act on peptide bonds, breaking down proteins into amino acids.

Question 2

Why must animals remove ammonia from their bodies?

Accepted Answer

Ammonia is a byproduct of protein metabolism and is toxic.

Question 3

Which animal would be under the least selective pressure to concentrate its urine?

Accepted Answer

Freshwater turtle

Question 4

What feature of an animal’s environment most influences the need to concentrate urine?

Accepted Answer

Access to free water

Question 5

Which of the following is NOT a step in the basic function of the excretory system?

Accepted Answer

Photosynthesis

Question 6

During which step of nephron function is glucose primarily recovered from the filtrate?

Accepted Answer

Recovery in the proximal tubule

Question 7

Which statement about the kidney is most misleading if taken literally?

Accepted Answer

Water recovery is passive, while solute recovery is active.

Question 8

Which hormone controls water recovery in the lower collecting duct of the nephron?

Accepted Answer

Vasopressin (antidiuretic hormone, ADH)

Question 9

What is a primary advantage of a closed circulatory system over an open circulatory system?

Accepted Answer

It allows for more efficient transport of oxygen and nutrients to tissues.

Question 10

Which of the following best describes the function of portal vessels?

Accepted Answer

They convey blood from one capillary bed to another capillary bed.

Question 11

Which of the following statements about blood oxygenation is correct?

Accepted Answer

Both oxygenated and deoxygenated blood are red.

Question 12

In insects, how is oxygen delivered to tissues?

Accepted Answer

By a spiracle/tracheal system directly to cells

Question 13

Which of the following is true about gas exchange in aquatic vertebrates?

Accepted Answer

They use a closed circulatory system and gills.

Question 14

What is the main disadvantage of a single-circuit circulatory system, as seen in fish?

Accepted Answer

Blood pressure drops significantly after passing through the gills.

Question 15

Which of the following best describes negative pressure breathing in mammals?

Accepted Answer

Air is pulled into the lungs primarily by the diaphragm.

Question 16

How does the medulla in the human brain primarily regulate breathing?

Accepted Answer

By detecting low pH in cerebrospinal fluid

Question 17

Which of the following statements regarding gas exchange at sea level is true?

Accepted Answer

The partial pressure of oxygen is higher in air than in water.

Question 18

Hemoglobin increases the blood’s ability to hold oxygen by approximately how much?

Accepted Answer

$$\sim 50$$ fold

Question 19

If an animal is chronically exposed to low oxygen environments, which adaptation is most likely?

Accepted Answer

Increase in red blood cell and hemoglobin production

Question 20

Which equation best represents the relationship between partial pressure, concentration, and solubility of a gas in a liquid?

Accepted Answer

$$C = k_H \cdot P$$

Animal Nutrition, Excretion, Circulation, and Respiration: Lecture 6

Study Guide - Practice Questions