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Flashcards in Amphibians Deck (30)
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1

what are the two groups of bony fish?

ray finned fish and lobe finned fish

2

Coelacanth was thought to go extinct but in 1938 was found in a...

South African fish market

3

How do Lungfish "walk"

they walk on their lobe-fins

4

How do Lung fish breathe?

They breathe through their gills and primitive lungs

5

What do lung fish do during droughts?

estivate in mud and wait until the water comes back

6

Tetrapod is an animal with ___ limbs

four

7

why move on land?

Devonian droughts - shallow inland seas, swamps and ponds

8

why move on land?

Increased competition in the water - small pools were becoming crowded

9

why move on land?

New food resources on land such as arthropods and plants

10

why move on land?

No vertebrate predators - a way to escape predators

11

What are the five differences between land and water as relevant to life?

1. availability of water/moisture
2. density of medium
3. amount of oxygen
4. stability of temperature
5. amount of UV radiation

12

What are the advantages of terrestrial respiration?

Air has a higher concentration of oxygen

13

What are the advantages of terrestrial respiration?

Gases diffuse faster in air than water
- insects don't ventilate

14

Most gas exchange is through which process?

diffusion

15

Lung evolution: 2 ventral pockets formed off of the??

esophagus

16

Problems on Land?

water needed to prevent desiccation
- gas exchange requires a moist surface
- water is often required for fertilization
- water is recovered through condensation (important for animals who live in deserts)
- water is required to keep eggs moist so they don't dry out

17

Problems on Land?

air is less dense than water
- requires stronger skeletal support muscles - body is mostly water so you don't need a lot of force pushing up on you in water

18

Problems on Land?

Air temperature is more variable
- body temperature will fluctuate more
- need to modify behaviour/physiology
- water has a pretty stable temperature
- temperature change from day to night is very drastic

19

Problems on Land?

UV Radiation
- physical protection or change in behaviour is necessary
- can lead to mutations

20

Tetrapod solutions to land problems: Air is less dense than water

tetrapods have stronger limbs, vertebral columns, ribs to help them carry their bodies around on land

21

What was the tail used for in early tetrapods?

balance (not swimming)

22

Tetrapod solutions to land problems: O2 to be brought in and distrubited

more efficient circulatory system

23

what kind of circulatory system do tetrapods have?

3 chambered heart double circuit of blood flow

24

what's the circulatory system in fish?

- 2 chambered hear
- blood oxygenated in the gills
- single circuit circulation
- relatively low pressure is required

25

describe the circulatory system in amphibians?

- 3 chambered heart
- blood is oxygenated in the lungs and skin
- double circuit circulation
- advantages (blood is under higher pressure)
- Disadvantages: blood is mixed

26

Breathing: when volume goes up, pressure goes...

down (I'm yelling timberrr you better run you better dance let's make the night you won't remember I'll be the one you won't forget oooo ooo ooo)

27

Amphibians have ____ pressure breathing

POSITIVE

28

inhalation is a ___ stroke process

two

29

how many species of amphibians are there?

6000

30

do they have scales?

no.