chapter 41 section 3

Question 1

swim bladder

Answer 1

gas filled sac used to control bouyancy

Question 2

urinary bladder

Answer 2

urine is stored and later expelled from here

Question 3

lobe finned fish

Answer 3

fleshy fins supported by series of bones with central axis

Question 4

ray finned fish

Answer 4

fins supported by long segmented flexible bony elements.

Question 5

gallbladder

Answer 5

stores bile and releases it into the intestine

Question 6

pancreas

Answer 6

releases digestive enzymes into the intestine.

Question 7

cranial nerve

Answer 7

the major sensory organs are connected with the brain by this cord

Question 8

spinal nerve

Answer 8

connects spinal cord with internal organs

Question 9

One of the functions of the scales on a bony fish is to

Answer 9

help reduce water resistance

Question 10

The coelacanth is an example of a

Answer 10

lobe finned fish

Question 11

The part of a fish’s digestive tract that secretes bile is the

Answer 11

liver

Question 12

In a fish, the blood that leaves the heart goes first to the

Answer 12

gills

Question 13

Fish gills are efficient organs for gas exchange because they

Answer 13

operate on the principle of countercurrent flow

Question 14

Explain how the scales of a bony fish can be sued to estimate the age of those fishes

Answer 14

annual variations in food = good approximation of age through scales

Question 15

What two organs are involved in maintaining water and ion balance in a bony fish?

Answer 15

kidney and gills

Question 16

How does a bony fish adjust its buoyancy?

Answer 16

varying the amount of gas in its swim bladder

Question 17

Where does fertilization occur in bony fishes?

Answer 17

externally in most species

internally in some species

Question 18

Why would a fish with faulty valves in its conus arteriosus probably suffer
from a lack of energy?

Answer 18

Faulty valves would allow blood to flow back into
the ventricle, making delivery of blood to the gills
less efficient. Body cells would therefore receive
less oxygen and make less ATP.