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; $$\mathrm{CO(NH_2$)_2}$$

Question 3

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

Accepted Answer

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

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 constant 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 insects is responsible for excretion and osmoregulation, as shown in the diagram?

Accepted Answer

Malpighian tubules

Question 10

A lizard basks in the sun to raise its body temperature. This is an example of:

Accepted Answer

Behavioral thermoregulation in an ectotherm

Question 11

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

Accepted Answer

It integrates signals from the nervous and endocrine systems.

Question 12

Which of the following is a correct sequence of events in the excretory process of vertebrates?

Accepted Answer

Filtration → Reabsorption → Secretion → Excretion

Question 13

Which of the following is a real-life example of a hormone with multiple effects depending on the target tissue?

Accepted Answer

Epinephrine increases blood flow to muscles but decreases blood flow to the digestive tract.

Question 14

Which adaptation helps marine fish avoid dehydration in a hypertonic environment?

Accepted Answer

Drinking seawater and excreting excess salts through their gills

Question 15

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

Accepted Answer

Uric acid is less toxic and conserves water, which is crucial for animals in dry environments.

Question 16

Which of the following is NOT a function of the vertebrate kidney?

Accepted Answer

Production of digestive enzymes

Question 17

Which of the following best describes the role of negative feedback in homeostasis?

Accepted Answer

It counteracts changes to maintain a stable internal environment.

Question 18

Which of the following is a correct statement about osmoregulation in freshwater versus marine fish?

Accepted Answer

Freshwater fish actively absorb salts through their gills, while marine fish actively excrete salts through their gills.

Question 19

Which of the following is an example of a conformer?

Accepted Answer

A fish whose body temperature changes with the surrounding water

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.

Homeostasis and Endocrine Signaling: Regulation, Osmoregulation, and Excretion

Study Guide - Practice Questions