Chapter 9 Part 1

Question 1

Basic components of fins/limbs

Answer 1

Only paired fins=pectoral/pelvic fins
Braced by girdles inside body wall

Question 2

Chiridium-

Answer 2

limb

Question 3

Manus-

Answer 3

distal portion of forelimbs

Question 4

Pes-

Answer 4

distal hindlimbs

Question 5

Glenoid fossa-

Answer 5

socket for upper limb

Question 6

Acetabulum-

Answer 6

socket for lower limb

Question 7

Early fishes become more active-

Answer 7

needed more stable body plan, fins stableize, girdles serve as muscle attachments

Question 8

Manus and Pes-earliest tetrapods were

Answer 8

plolydactylous

Question 9

Most tetrapods today have

Answer 9

5 digits, basic organization

Question 10

Why venture into land?

Answer 10

To keep fish IN water
To escape predation in water
To find food

Question 11

Onto land: fins musculature could not bear…

Answer 11

body weight on land but could be used as pivot points

Question 12

Onto land: Some used swimming anatomy to make short

Answer 12

trips across land

Question 13

Different modes of terrestrial locomotion placed diffenrent

Answer 13

mechanical demands on appendicular skeleton

Question 14

Limbs underwent extensive morphological

Answer 14

changes

Question 15

Modes of locomtion:

Answer 15

swimming, cursorial-running, fossorial-burrowing