I'm like a BIRD I wanna fly away I don't know where my home is. Flashcards Preview

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Flashcards in I'm like a BIRD I wanna fly away I don't know where my home is. Deck (40)
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1

what's probably the ancestor to the bird?

Theropod dinosaur

2

what are shared characteristics between birds and dinosaur ancestor?

- bipedal - 3 hind toes
- carnivorous
- 4 chambered heart
- similar lungs
- feathered
- hollow bones
- parental care of eggs and juveniles

3

Characteristics of a archeopetryx

- crow-sized
- feathers
- wings
- teeth
- bony tail

4

How many species of birds are there?

9600

5

characteristics of birds

amniotes

6

characteristics of birds

endoterhmic

7

characteristics of birds

4 chambered heart

8

characteristics of birds

completely separate pulmonary and systemic circuits

9

characteristics of birds

feathers

10

characteristics of birds

most can fly

11

characteristics of birds

diverse beaks = diverse diets

12

thermoregulation definition

body temperature control

13

Ectotherms

- absorb external heat
- depend on environment

14

most mammals are

ectothers

15

Endotherms

generate their own internal heat through metabolic process

16

How do endotherms generate heat?

Less efficient at transforming energy

17

metabolic rate is the ...

sum of ALL energy expenditures

18

It was thought that the metabolic rate of lizards would _____ as temperatures increased

increase

19

In the field, what was the body temperature of a lizard?

the lizard maintained its body temperature at a different temperature than its environment

20

How does a lizard maintain its body temperature between upper and lower limits?

by moving between hot and cold microhabitats

21

what are the three types of thermoregulation?

1. behavioural
2. physiological
3. physical

22

Example of physiological thermoregulation

human thermostat
- if temperature is too high: sweat - evaporative cooling
- temperature is too cold: decrease blood flow to periphery, shivering

23

Behavioural thermoregulation

orientation relative to heat source - basking, huddling and varying contact with heat surface
- moving locations throughout the day

24

Physical thermoregulation

- insulation (fur, feathers, fat)
- colour
- ratio of surface area to volume

25

Flying and endothermy demand large amounts of...

oxygen

26

Describe the Respiratory system of a bird

- unidirectional flow of air through lungs

27

ventilation in birds: breath 1

- air is drawn into the posterior air sacs
- air is propelled through the lungs

28

ventilation in birds: breath 2

- same air is drawn into the anterior air sacs
- same air is propelled out through the nares

29

how many cycles does it take for any breath of air to go in and come out?

2 cycles

30

how many times has flight evolved?

4 times