Title: Internal Anatomy – Respiratory and Circulatory Systems
Purpose: To identify the internal organs associated with the respiratory and circulatory
systems the structures to their function. To compare the respiratory and
circulatory systems of the frog to that of the human.
Procedures:
1. Refer to the diagrams below to identify the parts of the circulatory and respiratory systems that are
in the chest cavity. Identify the glottis, lungs, and the left atrium, right atrium, and ventricle of the
heart. Also, on the heart find the major blood vessels that carry blood from the heart to the body.
These blood vessels include the conus arteriosus and the pair of arteries that branch off the conus
arteriosus called the truncus arteriosus. Find an artery attached to the heart and another artery near
the backbone. Find a vein near one of the shoulders. Label these parts on your diagram.
2. Carefully dissect out the heart. You will cut the heart in half using a frontal section. This will allow
you to see the three chambers of the heart. Use the diagram below to help you identify the parts of
the frog heart.
Data Table:
System
Respiratory
Circulatory
Organ
Nares
Glottis
Bronchi
Lungs
Atria
Ventricle
Conus Arteriosus
Truncus Arteriosus
Aorta
Posterior Vena Cava
Pericardium
Function
Analysis Questions
1. How does a frog take air into its lungs? What other methods does the frog use to take in
oxygen? How have these adaptations helped the frog live its life in water and on land?
2. Describe the route blood takes through the chambers of the frogs’ heart.
3. How are the respiratory and circulatory systems inter-related?
Conclusion Questions
1. What did you learn about the frogs respiratory and circulatory systems?
2. How does the frog and human respiratory and circulatory systems compare? What structures
and functions are similar and different?