1. Heart
The heart is the motor in charge of pumping the blood through the body. Oxygen is attached to the blood, but also other building materials used by different organs are transported through the body in this way.
2. Lungs
Lungs are used for breathing. Oxygen is taken from the air and attached to the blood. Carbon dioxide is removed from the blood as a waste product via the lungs. Ventilation takes place with the aid of muscles.
3. Liver
The liver produces substances that are necessary for the digestion of food. It also takes care of the discharge of waste and makes toxins harmless.
4. Stomach
In the stomach fish is processes and broken down into particles.
5. Intestines
After the fish has been broken down in to small particles, the intestines remove the useful nutrients. All the water is removed too, which saves the seal having to drink salty seawater.
6. Spleen
A seal’s spleen is relatively large. It is the organ where ‘worn-out’ blood cells are broken down. It also stores extra red blood cells, which can be included in the circulatory system through a contraction of muscles.
7. Pancreas
The green is the pancreas. It is an organ that produces enzymes for the digestion of foods. It also produces hormones that take care of several other processes in the body.
8. Kidney
The kidney is an organ which regulates the balance of fluids and excretion of urea. A seal’s kidney consists of a great many small kidneys in one organ, which causes a concentration of the urine (advantage: less water loss) and creates a larger capacity. This enables the kidney to process the large quantities of salt in the seal’s body.
9. Bladder
The Bladder collects urine excreted by the kidneys prior to disposal by urination.