Three Frog Questions from Disection

1. The frog's heart is located directly ventral (underneath) the lungs. This helps the fresh oxygen to be pumped at higher pressure after leaving the heart, and lower pressure right before the heart. This is because pressure lowers along the system. This means that gas exchange has more time to occur later on when the blood is less oxygenated right before the lungs.

2. There are arteries and veins lining the intestines and stomach.

3. The transport epithelia work via pressure filtration (due to blood pressure) to transport oxygen out of the blood stream and into the tissue of the digestive system from the circulatory system. The intestines use the same filtration to get nutrients from food into the blood stream, which transports the nutrients around the body.

4. Frogs rely on environmental changes for their bodies to warm up, so they should be more active during the daytime, when their blood is more active.