Circulatory

Question 1

Thin walled venous chamber

Answer 1

Sinus venosus

Question 2

Large and thin walled chamber

Answer 2

Atrium

Question 3

Thick and muscular chamber

Answer 3

Ventricle

Question 4

Represented by a muscular swelling at base of ventral aorta

Answer 4

Conus arteriosus

Question 5

Advent of lungfish and amphibian lungs

Answer 5

Double circulation

Shortened ventral aorta

Question 6

Directs oxygenated blood entering ventricle from left atrium

Answer 6

Spiral valve

Question 7

Swelling of ventral aorta; smooth muscle

Answer 7

Bulbous arteriosus

Question 8

Urodele (newts and salamanders)

Answer 8

Partially divided circulation
Sinus venosus empties into right atrium
Pulmonary veins leave left ventricle

Question 9

A third ventricular chamber shunt between arteries leaving the heart in reptiles

Answer 9

Cavum venosum

Question 10

Mechanism for breathing and diving in crocodile heart

Answer 10

Lungs not utilized

Blood is not pumped into lungs

Question 11

Valve between aortic trunks to divert blood

Answer 11

Foramen panizza

Question 12

4 chambered heart

Answer 12

2 atria

2 ventricle

Question 13

5th chamber in reptile heart

Answer 13

Sinus venosus

Question 14

Flap on the side of atrium

Answer 14

Auricle

Question 15

Major arterial channels

Answer 15

Ventral aorta
Dorsal aorta
6 pairs of aortic arches

Question 16

Teloest aortic arches

Answer 16

1st and 2nd lost

Dorsal aortae become internal carotids

Question 17

Lungfish aortic arch

Answer 17

Pulmonary artery from 6th arch

Question 18

Tetrapods aortic arch

Answer 18

Pulmonary artery from 6th arch
5th arch lost
1st and 2nd arches lost
Dorsal segment dropped between 3rd and 4th arches - Ductus caroticus
3rd arch extends to external carotids
Common carotid at base between 3rd and 4th

Question 19

Tetrapods 4th arch

Answer 19

Aortic arch

Question 20

Tetrapods 6th arch

Answer 20

Pulmonary arch

Question 21

Mammalian aortic arches

Answer 21

3rd, 4th, 5th, and 6th retained embryonically

Question 22

Adult mammal aortic arch

Answer 22

1st and 2nd dropped

Question 23

3rd mammalian arch

Answer 23

Carotid arch

Question 24

4th mammalian arch

Answer 24

Systemic arch

Question 25

5th and 6th mammalian arch

Answer 25

Lost

Question 26

Bird aortic arch

Answer 26

Right is retained

Left is lost

Question 27

Birds vs Mammals arch

Answer 27

Birds have right

Mammals have left

Question 28

Where all blood returns

Answer 28

Sinus venosus

Question 29

Drains blood from tail before entering post cardinal

Answer 29

Shark renal portal system

Question 30

Major venous channels

Answer 30

Cardinals
Renal portal
Lateral abdominal
Vitellines
Coronary veins

Question 31

Directs blood to sinus venosus

Answer 31

Common cardinals

Question 32

Receive blood from head

Answer 32

Anterior cardinals

Question 33

Receives blood frim kidneys

Answer 33

Post cardinals

Question 34

Receives blood from caudal vein

Answer 34

Renal portal

Question 35

Receive blood from abdominal stream to iliac

Answer 35

Lateral abdominis

Question 36

Receives blood from intestine into liver

Answer 36

Hepatic portal veins

Question 37

Direct blood into sinus venosus

Answer 37

Hepatic veins

Question 38

Vestige of right post cardinal veins

Answer 38

Azygous

Question 39

Remnant left of post cardinal

Answer 39

Hemiazygous

Question 40

Post cava

Answer 40

Inferior vena cava