Includes the liver, gall bladder, pancreas, and the gastrointestinal tract. GI- stomach, small and large intestine, and rectum. Sea otters do not have a cecum.

Breaks down food into nutrients such as carbohydrates, fats, and proteins. They can then be absorbed into the bloodstream so the body can use them for energy, growth, and repair.

Similar to humans, sea otters have a closed circulatory system meaning their blood travels through arteries and veins, rather than being free to be anywhere in the body.

Transports oxygen throughout their body and disposes of the carbon dioxide waste.

They have a 4 chamber heart. Also have a countercurrent heat exchange system.

Above shows the different parts of the Sea Otter's skull.

Instead of having gills they have lungs.

Their mouth and nose is the entrance of oxygen into the respiratory system. From there, it goes through the trachea then to the lungs where diffusion occurs.

The alveoli inside their lungs transfers oxygen into the blood and carbon dioxide out of the blood, being released in the otter's exhale.

FUN FACT: Otters can hold their breath for up to 8 minutes and

during the winter they cut holes in the ice to provide a passage to air.