40. Animal Metabolism, Nutrition, and Digestion Flashcards Preview

Biology 241 > 40. Animal Metabolism, Nutrition, and Digestion > Flashcards

Flashcards in 40. Animal Metabolism, Nutrition, and Digestion Deck (41)
1

metabolic rate varies with an animal's:

activity, internal body temperature, and size

2

adenosine triphosphate (ATP)

the molecule that provides energy in a form that all cells can readily use to perform the work of the cell. ATP is the universal energy currency for all cells

3

catabolism

the set of chemical reactions that break down molecules into smaller units and, in the process, produces ATP to meet the energy needs of the cell

4

anabolic

the set of chemical reactions that build molecules from smaller units utilizing an input of energy, usually in the form of ATP. anabolic reactions result in net energy storage within cells and the organism

5

anaerobic metabolism

energy metabolism in the absence of oxygen-provides rapid but short-term energy to the cell and organism

6

aerobic metabolism

energy metabolism that uses oxygen gas to oxidize organic compounds, generating ATP; found in Bacteria, Archaea, and the mitochondria of eukaryotic organisms

7

citric acid cycle

the third stage of cellular respiration, in which acetyl-CoA is broken down and more carbon dioxide is released

8

electron transport chain

the system that transfers electrons along a series of membrane-associated proteins to a final electron acceptor, using the energy released as electrons move down the chain to produce ATP

9

metabolic efficiency

the amount of energy captured in a usable form per amount of energy in the starting molecule

10

what is the metabolic efficiency of aerobic respiration?

at least 34%-other 66% converted to heat and lost to the environment or used to warm the animal

11

glucose that is not metabolized is stored as:

glycogen, primarily in the liver and muscles

12

lipids such as triacylglycerol are broken down to:

glycerol and free fatty acids which enter glycolysis or the citric acid cycle to yield ATP by oxidative phosphorylation or stored as fat (adipose tissue)

13

what do animals preferentially rely on for long-term energy supply?

fats

14

carbohydrates are always spared for the:

brain and nervous system

15

protein can also be an energy source but only broken down when...

fat and carbohydrate reserves are depleted

16

metabolic rate

an animal's overall rate of energy use

17

how do you measure metabolic rate?

by measuring the animal's rate of oxygen consumption, which reflects the rate of aerobic production of ATP

18

the onset of activity requires immediate energy, which in animals, is provided by:

specialized energy stores in their tissues

19

in vertebrate muscle cells, for example, what is a ready source of high-energy phosphates that is hydrolyzed to synthesize ATP directly from ADP at the onset of activity?

phosphocreatine

20

although glycolysis produces relatively few ATP, it is relatively fast providing:

rapid short-term supply of energy for animals-good for short bursts of intensive activity

21

what supplies energy for longer activity?

aerobic respiration in the mitochondria-intially the rate of oxygen consumption increases, then levels off

22

once mitochondrial ATP production increases, the steady state production of ATP depends on:

adequate transport of oxygen to the tissue by the cardiovascular system as well as by diffusion of oxygen into mitochondria

23

recovery metabolism

an animal's elevated consumption of oxygen following activity-represents the continued metabolic energy required to re-establish the resting metabolic state of the cells

24

what occurs during recovery metabolism?

the cells re-synthesize depleted ATP stores and metabolize the end products of fermentation, particularly lactic acid

25

"oxygen debt"

the difference between an animal's immediate energy need at the onset of activity and energy supplied by aerobic metabolism, it is "paid back" following exercise by the animal's recovery metabolism

26

heat storage seems to enable:

quick bursts of speed, has evolved as an adaptation among both predators and prey to achieve short, rapid sprints

27

at rest, larger animals consume:

more energy and have higher metabolic rates than smaller ones

28

resting metabolic rate increases with:

animal mass raised to the 3/4 power

29

the average rate at which each gram of body tissue consumes energy is....

LESS in larger animals compared to smaller ones

30

the larger the organism, the...

LOWER the metabolic rate PER GRAM of body tissue

31

metabolic rate increases linearly with...

speed-larger animals expend less per unit mass than smaller ones

32

an animal's internal body temperature can affect the rate of chemical reactions which in turn determines how fast:

fuel molecules can be mobilized and broken down to supply energy for a cell

33

endotherm

an animal that produces most of its own heat as by-products of metabolic reactions-generally maintain a constant body temperature that is higher than that of their environment

34

ectotherm

an animal that obtains most of its heat from the environment-body temperatures regulated by changing their behaviour

35

endotherms have a higher...

metabolic rate than ectotherms, endotherms are able to be active over a broader range of external temperatures than ectotherms

36

the activity level and metabolic rate of ectotherms increase with...

increasing body temperatures

37

ectotherms that are of similar body mass at temperature to an endotherm have metabolic rates that are:

25% of the endotherm

38

even when the body temperatures are similar, ectotherms cannot sustain:

prolonged activity

39

endotherms benefit from having an active lifestyle but requires:

lots of food to keep warm and be active

40

although ectotherms cannot sustain activity for long periods, they can survive longer periods without....

food

41

the control of core body temperature or thermoregulation is a form of:

homeostasis and requires the coordinated activities of the nervous, muscular, endocrine, circulatory, and digestive systems.