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Flashcards in Fishes Deck (58)
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1

FLASHBACK: what tare the characteristics unique to chorodates

- notochord
- post-anal tail
- dorsal hollow nerve cord

2

where are pharyngeal slits located?

on lateral surface of the head

3

pharyngeal slits seam to be an _______ trait in deuterostomes

ancestral

4

In vertebrates, pharyngeal tissue is supported by what?

arches

5

What is the function of the pharyngeal slit?

filter feeding - water goes in and out through these slits

6

How do vertebrates breathe?

- water comes in though the mouth and passes through the slits
- O2 and CO2 can be exchanged across a respiratory surface = gills

7

where are the gills located?

between the slits

8

how are the gills supported?

by the arches

9

Gill slits =

pharyngeal slits

10

gill arches =

bars between the slits

11

where are the gill filaments located?

on the gill arches

12

how many pairs of gill arches do bony fish have?

four

13

operculum is a

gill cover

14

the structure of the gill filament is

a thin, vascularized, high surface area

15

where does gas exchange occur?

in the capillary beds in the gill filaments

16

Water and blood in which directions?

opposing

17

the water comes from the ____ across the filament between the _____

mouth ; lamella

18

when is efficiency of gas exchange low?

when the inside medium (in this case the blood) flows in the same direction as the outside medium (in this case the water)

19

Why does blood flow in the opposite direction to water flow?

so that concentration gradients are maintained along the length of the exchange area

20

the circulatory system of fish is

closed

21

describe the circulatory system

arteries (away from the heart ) --> arterioles --> capillaries
--> venules (towards the heart) --> veins

22

how many circuits do fish have?

one.

23

what circuits do we have?

pulmonary circuit and systemic circuit

24

pulmonary circuit

heart --> lungs --> heart

25

systemic circuit

heart --> body --> heart

26

where is the fish heart located?

ventrally

27

characteristics of vertebrates

axial skeleton

28

characteristics of vertebrates

appendicular sksleton

29

characteristics of vertebrates

closed circulatory system

30

where are organs suspended in vertebrates

coelom