AEI

Question 1

Which choice offers the best time to measure basal metabolic rate of a nongrowing mammal?
i. at rest prior to the first meal of the day. ii. at rest just after the first meal of the day. iii. immediately after eating a sugar-free meal. iv. one hour after exercising for 30 minutes.

Answer 1

at rest prior to the first meal of the day.

Question 2

The term ‘endotherm’ refers specifically to:
i. an animal that temporarily abandons warm-bloodedness. ii. a cold-blooded animal. iii. an animal that gets most of its body heat from its metabolism. iv. an animal that regulates its body temperature by its behaviour

Answer 2

an animal that gets most of its body heat from its metabolism

Question 3

Where is the physiological thermostat of mammals located?

i. medulla oblongata. ii. thyroid gland. iii. hypothalamus. iv. subcutaneous layer of skin

Answer 3

hypothalamus.

Question 4

Homeostasis can be defined as:
i. the tendency toward uniformity or stability in the internal environment of living organisms. ii. the tendency toward uniformity or stability in the external environment of living organisms. iii. the tendency toward heat production in the internal environment of living organisms. iv. the tendency toward instability in the external environment of living organisms.

Answer 4

the tendency toward uniformity or stability in the internal environment of living organisms

Question 5

Which of the following best describes the relationship between body size and mass-specific metabolic rate (MR) in mammals?
i. as body size increases, mass-specific MR increases. ii. it is not possible to predict mass-specific MR based on body size. iii. as body size increases, mass-specific MR decreases. iv. as body size increases, mass-specific MR stays the same.

Answer 5

as body size increases, mass-specific MR increases.

Question 6

Which one of the following animals would you expect to consume food at the highest rate (ie, kilograms of food per kilogram of body weight per day)?
i. dog ii. sheep iii. horse iv. mouse

Answer 6

horse

Question 7

Which of the following is NOT an evolutionary adaptation of small terrestrial mammals to cold?
i. Thick, dense, insulating fur coat. ii. Heat production primarily due to non-shivering thermogenesis. iii. Communal nesting. iv. Large amounts of brown adipose tissue.

Answer 7

Thick, dense, insulating fur coat

Question 8

Which of the following is NOT a water-saving adaptation of the camel?
i. nasal passages with large surface area. ii. water storage in the hump. iii. large body size. iv. heat storage during the day.

Answer 8

large body size

Question 9

Which of the four physical processes of heat exchange is operating when ambient temperature is above the Upper Critical Temperature of a mammal?
i. conduction ii. evaporation iii. convection iv. radiation

Answer 9

evaporation

Question 10

Which of the following is a process that may occur in mammals during heat acclimatisation?
i. growing a heavier fur coat ii. decreased blood flow to the periphery iii. more time spent lying in the sun iv. increased production of sweat

Answer 10

increased production of sweat

Question 11

Which of the following is true about counter-current exchangers?
i. blood flowing outwards to peripheral tissues bypasses the skin. ii. found only in the tissues of large mammals. iii. increase heat loss from the body core of mammals. iv. heat from arterial blood is transferred to venous blood.

Answer 11

heat from arterial blood is transferred to venous blood.