What are the 4 valves of the fetal pig and sheep hearts?

The four valves of the fetal pig and sheep hearts are the tricuspid valve, pulmonary valve, mitral (or bicuspid) valve, and aortic valve. The tricuspid valve is located between the right atrium and right ventricle, while the mitral valve is between the left atrium and left ventricle. The pulmonary valve controls blood flow from the right ventricle to the lungs, and the aortic valve regulates blood flow from the left ventricle to the aorta. These valves ensure unidirectional blood flow through the heart's chambers.