1. Paired fins: pelvic fins, pectoral fins help the fish turn
Caudal fin: (tail fin) propels fish forward
Lateral line: found running along the side of the body from head to just before the tail

3. Internal anatomy: the digestive system
Most fish are carnivorous
Food moves through the mouth to the pharynx then the esophagus into the stomach
In the stomach, acid & other digestive juices break down the food
The food then moves into the intestines

4. Fish have many accessory organs like humans to help digest the food.
Liver: lies next to the stomach & secretes bile to help break down fats
Gallbladder: stores extra bile & releases it into the intestines when needed

5. Pancreas: also lies near the stomach & releases additional digestive juices into the intestine to finish digestion of food
After all possible nutrients are removed from the food, the remains are pushed out of the body through the anus

6. Circulatory system
The circulatory system of the fish delivers oxygen & nutrients to all the cells of the body
It also picks up waste products from the cells & delivers it to the gills for removal
The circulatory system consists of a heart, blood vessels & blood

8. The heart has two chambers
Deoxygenated blood comes from the body & fills the atrium chamber
The atrium contracts & the blood is pushed into the larger more powerful ventricle chamber
The ventricle contracts sending the blood to the gills to pick up oxygen
This oxygenated blood is then pumped to the rest of the body

9. Respiratory system
The large surface area of the gills allows for rapid gas exchange
The gills are supported by four sets of curved bones on each side of the head
Water is taken into the mouth & then pumped over the gills
Oxygen is removed from the water as it passes over the gills & then is released through the operculum

10. Excretory system (urine production)
The kidney’s filter the blood & removes waste products
The resulting solution is called urine
Urine is carried from the kidneys to the bladder where it is later expelled from the body

11. The nervous system
The nervous system includes the brain, spinal cord, nerves and various sensory organs
The forebrain processes smell
The cerebrum coordinates messages coming from the rest of the body

12. The midbrain processes sight, sound & lateral line information
The cerebellum coordinates muscles & balance
The medulla oblongata controls the circulatory, respiratory & digestive systems

13. The End