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Flashcards in Week 4 Deck (54)
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31

Ectothermal fish

Agnathans

32

Most diverse group of vertebrates

Teleosts

33

Features of teleosts

Bony endoskeleton
Modified full arches
Internal air bladder for balance and buoyancy

34

Body temperatures vary as ambient temperatures change

Ectothetmic

35

The first land vertebrates

Amphibians

36

What terrestrial vertebrate Lay eggs in water

Amphibians

37

Major evolutionary events enabling amphibian terrestrial existence

Development of legs and lungs

38

Why are amphibian lungs primitive

They have a slow diffusion rate of oxygen into the blood

39

What accounts for most of the oxygen diffusion in amphibians

Soft moist skin

40

Where does air exchange occur in reptiles

Lungs

41

Outermost membrane of reptile eggs

Chorion

42

3 chambers of reptile hearts

Atria
Ventricle
Aorta

43

Body temperatures depends on environment

Poikilothrrmic

44

What Thermic are reptiles

Poikilothermic

45

Maintain constant body temperatures

Homeothermic

46

What thermic are birds

Homeothermic

47

Adaptations for flight

Constant energy supply
High metabolism
Lightweight skeleton
Efficient respiratory system

48

Birds recieve what during inhalation and exhalation

Constant supply of fresh air

49

How many chambers do bird hearts have

Four chambers

50

Is the development of bird embryos external or internal

External

51

What is a birds most highly developed sense

Vision

52

Covered with insulating body fat and hair

Mammals

53

Maintain homeostasis (constant body temperatures)

Birds and mammals

54

How many chambers do mammal hearts have

4