Homeostasis Multiple Choice Practice NEL
Multiple Choice
Identify the choice that best completes the statement or answers the question.
1. What is homeostasis?
b. responding to changes in the external
a. the process in which internal conditions are
environment
kept within a tolerable range
c. moving
b. the process in which the internal conditions are
d. synthesizing proteins, fats, and carbohydrates
kept constant
8. How are mammals able to maintain their body
c. the process in which the body responds to the
temperature?
external environment
a. shivering or sweating
d. the process in which the internal temperature is
b. constricting or dilating vessels
kept constant
c. seeking shelter or shade
2. Which of the following is an example of
d. all of the above
homeostasis?
9. What elements are involved in homeostatic
a. diabetes
mechanisms?
b. hyperventilation
a. thermoreceptor, set point, and effector
c. fevers
b. sensor, integrator, and effector
d. sweating
c. stimulus, sensor, and effector
3. Which internal factor must be monitored and
d. sensor, responder, and effector
adjusted to maintain homeostasis? Choose the best
10. What is an environmental change that triggers a
answer.
change in external or internal factors called?
a. blood pressure
a. an integrator
b. internal temperature
b. a sensor
c. blood pH
c. an effector
d. all of the above
d. a stimulus
4. How much extracellular fluid does the human body
11. Which component in a thermostat is representative
contain?
of a sensor?
a. 20 L
a. circuit
b. 10 L
b. thermistor
c. 15 L
c. furnace or air conditioner
d. 25 L
d. thermoreceptor
5. What constitutes the internal environment?
12. What is the role of the integrator?
a. plasma
a. to activate the effector if necessary
b. extracellular fluid
b. to return the system to its optimal state
c. interstitial fluid
c. to detect changes in the environment
d. all of the above
d. to respond to the stimulus
6. Which organ systems are the most important
13. Which condition is maintained by negative
systems for maintaining homeostasis?
feedback?
a. muscular and digestive
a. blood pH
b. nervous and endocrine
b. respiration rate
c. nervous and excretory
c. blood pressure
d. excretory and integumentary
d. all of the above
7. Which task would not be considered necessary for
the survival of an organism?
a. taking in nutrients
14. Which of the following is an effector activated by
the hypothalamus when the temperature of the body
is lower than the set point?
a. sweat glands initiate sweating
b. move to a warmer location or put on a sweater
c. skeletal muscles contract
d. skin blood vessels dilate
15. What is an example of positive feedback?
a. labour contractions during birth
b. an air conditioner turns on when the
temperature rises
c. sweating when you are hot
d. increased respiration during exercise
16. What are thermoreceptors?
a. receptors that detect deviations from an internal
set point temperature
b. receptors that adjust the rate of exothermic
reactions
c. receptors that adjust the rate of thermal energy
exchange through the body’s surface
d. all of the above
17. How is thermal energy transferred through
sweating?
a. evaporation
b. convection
c. radiation
d. conduction
18. Cold air displaces warmer air. What does this
involve?
a. conduction
b. evaporation
c. convection
d. radiation
19. What is a poikilotherm?
a. a group that includes mammals and birds
b. an animal whose body temperature varies with
the external environment
c. an animal that can maintain a stable body
temperature regardless of external conditions
d. all of the above
20.How could you classify an animal that behaviourally
regulates its body temperature during the daytime?
a. homeothermic endotherm
b. poikilothermic ectotherm
c. homeothermic ectotherm
d. poikilothermic endotherm
21. By which method(s) of thermal energy transfer do
amphibians regulate their body temperatures?
a. conduction and radiation
b. conduction
c. radiation
d. conduction and convection
22. Why is an ectotherm likely to survive longer
without food than an endotherm of equal size?
a. the ectotherm has a higher metabolic rate
b. the ectotherm does not use energy to regulate
its temperature
c. the ectotherm expends more energy than the
endotherm
d. the ectotherm is better able to metabolize its
stored energy
23. What is an example of thermal acclimatization?
a. a lizard sunning itself on a rock
b. freshwater fish moving to deeper waters during
hot summer days
c. the Galapagos marine iguana increasing the
blood flow to exposed areas of skin
d. the wood frog spending winter in a frozen state
24. Which of the following would use panting
behaviour?
a. an endotherm that needs to cool down
b. an ectotherm that needs to warm up
c. an ectotherm that needs to cool down
d. an endotherm that needs to warm up
25. Which animals hibernate?
a. squirrels
b. hummingbirds
c. bears
d. lungfish
26.Why does the water move in the direction shown in the
diagram?
28.What is osmoregulation?
a. the regulating of osmotic pressure in bodily
fluids and cells
b. the regulating of water in cells
c. the regulating of hydrostatic pressure in bodily
fluids and cells
d. all of the above
29. Which animals produce urea?
a. cartilaginous fishes
b. insects
c. bony fishes
d. birds
a. The water moves to the area where the
concentration of the solute is low.
b. The water moves from an area of high water
concentration to an area of low water
concentration.
c. The water moves from an area where the
solution of the solute is high.
d. The water moves from an area of low water
concentration to an area of high water
concentration.
27. What condition does the diagram show?
30. What form of waste nitrogen is shown below?
a.
b.
c.
d.
uric acid
nucleic acid
urea
ammonia
31. Which organs are involved in the human excretory
system?
a. kidneys, bladder, ureters, and urethra
b. liver and pancreas
c. liver, kidneys, and bladder
d. sweat glands and skin
a. The solution on the left side of the membrane is
isoosmotic.
b. The solution on the left side of the membrane is
hyperosmotic.
c. The solution on the left side of membrane is
hypoosmotic.
d. The solution on the right side is hyperosmotic.
32. What would happen if a squid were mistakenly put
in freshwater?
a. It would be hyperosmotic to the freshwater and
could not osmoregulate.
b. It would be hypoosmotic to the freshwater and
could not osmoregulate.
c. Its cells would dehydrate.
d. It could not handle the change in osmotic and
hydrostatic pressures.
33. In relation to the seawater around them, lobsters
and other marine invertebrates are
a. hyperosmotic.
b. isoosmotic.
c. hypertonic.
d. hypoosmotic.
34. How and where is urea formed from ammonia?
a. the ammonia combines with HCO3– in the liver
b. the ammonia combines with uric acid in the
bladder
c. the ammonia combines with water in the
bladder
d. the ammonia combines with HCO3– in the
kidney
38.How do saltwater birds excrete excess salt?
a. salt is removed from the blood through active
transport
b. they have specialized salt glands in their heads
c. a salty secretion exits through the nostrils
d. all of the above
39. What organ is represented by A in the diagram?
35. What is the advantage of excreting urea rather than
ammonia as waste?
a. urea is less toxic than ammonia
b. urea requires less water for excretion
c. urea is very soluble
d. all of the above
36. What organ is represented by A in the diagram?
a.
b.
c.
d.
a.
b.
c.
d.
hemolymph
bladder
kidney
metanephridium
urethra
kidney
ureter
urinary bladder
40. What organ is represented by A in the diagram?
37. What organ is represented by A in the diagram?
a.
b.
c.
d.
kidney
hemolymph
metanephridium
bladder
a.
b.
c.
d.
ureter
kidney
urethra
urinary bladder
41.The following diagram shows the internal structure of a
human kidney. What part of the kidney is
represented by A?
44.Where does the filtrate go from the distal convoluted
tubule?
a. Bowman’s capsule
b. proximal convoluted tubule
c. loop of Henle
d. collecting duct
45. What causes kidney stones to form?
a. a buildup of cholesterol
b. a buildup of mineral solutes combined with
calcium
c. a buildup of mineral solutes, such as oxalates,
phosphates, and carbonates
d. a buildup of calcium
a.
b.
c.
d.
renal cortex
ureter
renal medulla
renal pelvis
42. What part of the kidney is represented by A?
a.
b.
c.
d.
ureter
renal medulla
renal pelvis
renal cortex
43. What part of the kidney is considered to be the
functional unit?
a. renal medulla
b. nephron
c. glomerulus
d. Bowman’s capsule
Homeostasis Multiple Choice Practice NEL Answer Section: MULTIPLE CHOICE
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