Exploring Endocrine, Circulatory, and Respiratory Systems


The purpose of this lab was to explore the endocrine, circulatory, and respiratory systems, and better understand the main functions of a number of their respective organs and structures. The result of the lab will determine the function of each studied organ or structure.


The endocrine system is composed by a combination of organs (endocrine glands) which have a hormonal secretion function. The circulatory system is a system of organs allowing movements of fluids in the body (blood), its role is to ensure the transport and exchange of internal resources (nutrients and oxygen) into the cells of the body. The respiratory system is, on the other hand, a set of organs which allows breathing, that is to say, gas exchange between body and environment.

Hypothesis/Predicted Outcome

The results of this lab are expected to show that the given systems are composed of organs and structures playing different roles which ensure the proper functioning of each of the three systems.


The procedures used in this lab consisted of linking each organ and structure among the three systems with its specific function. The lab also showed that even though a majority of organs secrete hormones, others will work as supporting structures without any secretion.


The outcome of the lab procedure generated data showing that each organ on the three systems has its specific function, be it excretion, transport, or just support. For instance, the thyroid gland secretes calcitonin and thyroxine, while the trachea only works as a supporting structure. Then again, in the respiratory system, the trachea conducts air to and from the bronchi (Career Education Corporation [CEC], 2010).


The expected results were obtained and the outcome of the lab results was expected. As a matter of fact, every organ or structure has its own specific function among the three systems; moreover, some organs like trachea can play different roles in different systems.