1. SHARK CIRCULATORY SYSTEM

2. HEART 2-chambered heart atrium auricle ventricle s-shaped tube
located in the anterior region
transports deoxygenated blood

3. HEART CHAMBERS Ventricle thick muscular walled cavity
pumps blood through conus arteriosus to the gills and body
Conus Anteriosus
contains a series of semi-lunar valves
help to direct the blood flow

4. HEART CHAMBERS Sinus Venosus
deoxygenated blood from the body returns here first before entering the artium
Atrium
receives blood from sinus venosus
thin-walled with 2 lateral bulging lobes
pumps blood to the dorsal ventricle

6. BLOOD FLOW Posterior cardinal sinuses
receives blood from the posterior parts of body
drains through cardinal veins into the sinus venosus
Blood enters through the sinus venosus
empties into the atrium

8. BLOOD FLOW
Anterior end of the conus arteriosus continue forward as the ventral aorta
gives off 5 pairs of afferent branchial arteries
pass laterally from the medial ventral aorta
carries deoxygenated blood from the heart to the gills

12. BLOOD FLOW Efferent branchial arteries
return oxygenated blood from the gills
give off many branches
carry oxygenated blood to the more anterior parts of the body
four pairs of efferent branchial arteries join at the dorsal midline to form the large dorsal aorta
passes posteriorly bringing oxygenated blood from the gills to virtually every part of the shark’s body

14. Venous System

15. Shark Heart, Ventral view
1.) ventricle 
2.) atrium 
3.) sinus venosus 
4.) coronary artery 
5.) conus arteriosus 
6.) ventral aorta 
7.) afferent branchial arteries

16. Shark Circulatory System organs removed
1.) internal carotid artery  2.) paired dorsal aortae  3.) efferent branchial arteries 4.) dorsal aorta  5.) subcalvian arteries 6.) posterior cardinal sinus  7.) celiac artery 8.) posterior cardinal veins 9.) anterior mesenteric artery  10.) lienogastric artery  11.) posterior mesenteric artery 12.) rectal gland  13.) iliac arteries