Question 1

Which of the following best describes how freshwater fish maintain osmotic balance in their environment?

Accepted Answer

They actively absorb NaCl across their gills and excrete large amounts of dilute urine.

Question 2

Which nitrogenous waste is primarily excreted by mammals, and what is its chemical formula?

Accepted Answer

Urea; $$CO(NH_2$)_2$$

Question 3

Which of the following is a key difference between endocrine and exocrine glands?

Accepted Answer

Endocrine glands secrete products directly into the internal environment, while exocrine glands secrete products to the external environment via ducts.

Question 4

A marine fish is placed in freshwater. Predict what would happen to its cells and explain why.

Accepted Answer

Its cells would swell and possibly burst due to water entering by osmosis.

Question 5

Which process in the vertebrate excretory system is responsible for reclaiming valuable solutes from the filtrate?

Accepted Answer

Reabsorption

Question 6

Which of the following best explains why endotherms must eat more frequently than ectotherms?

Accepted Answer

Endotherms require more energy to maintain a stable internal temperature.

Question 7

Which hormone is secreted by the adrenal glands and can cause increased blood glucose and increased blood flow to muscles?

Accepted Answer

Epinephrine

Question 8

Which of the following is an example of negative feedback in homeostasis?

Accepted Answer

Secretion of insulin to lower blood glucose after a meal.

Question 9

Which structure in terrestrial arthropods is responsible for excretion and osmoregulation, as shown in the bee diagram?

Accepted Answer

Malpighian tubules

Question 10

Why do most aquatic animals excrete ammonia ($$NH_3) as $$their primary nitrogenous waste?

Accepted Answer

Ammonia is highly soluble in water and can be easily diluted and excreted in aquatic environments.

Question 11

Which of the following best describes the function of the hypothalamus in neuroendocrine signaling?

Accepted Answer

It integrates signals from the nervous and endocrine systems and communicates with the pituitary gland.

Question 12

A lizard basks in the sun to raise its body temperature. This is an example of which type of thermoregulation?

Accepted Answer

Ectothermy with behavioral adjustment

Question 13

Which of the following is a correct sequence of steps in the vertebrate excretory process?

Accepted Answer

Filtration → Reabsorption → Secretion → Excretion

Question 14

Which of the following best explains why uric acid is excreted by birds and many reptiles instead of urea or ammonia?

Accepted Answer

Uric acid is less toxic and can be excreted with minimal water loss, which is important for animals in dry environments.

Question 15

Which of the following is a real-life example of positive feedback in the endocrine system?

Accepted Answer

Release of oxytocin during childbirth to intensify uterine contractions.

Question 16

Which of the following statements about osmoregulation in marine fish is correct?

Accepted Answer

Marine fish drink seawater and excrete excess salts through their gills and kidneys.

Question 17

Which of the following best describes the evolutionary significance of hormone function?

Accepted Answer

The function of a given hormone may diverge between species over evolutionary time.

Question 18

Which of the following is a correct statement about the relationship between osmoregulation and excretion?

Accepted Answer

Excretion and osmoregulation are linked because the removal of nitrogenous waste affects water and solute balance.

Question 19

Which of the following is a function of the Malpighian tubules in insects?

Accepted Answer

Removing nitrogenous waste and regulating water balance

Question 20

Which of the following best explains why enzymes have an optimum temperature range?

Accepted Answer

Enzyme structure and function depend on biochemical stability, which is affected by temperature.

Chapter 15: Homeostasis and Endocrine Signaling: Regulation, Osmoregulation, and Excretion

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