The AV valves open in only one direction because:

True or False:  Atherosclerotic plaques of peripheral blood vessels can cause an increase in the afterload. Constriction of those peripheral blood vessels affected by atherosclerosis can decrease the afterload on the heart.

During the Bainbridge reflex:

Which of the following is NOT released by activated platelets during the platelet phase?

Which of the following statements is FALSE concerning hemoglobin?

    15. Identify a specific hormone secreted by letter A.

17. Identify the specific tubes at letter F.

Identify 1 function of the hormone produced in the area labeled A.

                    20. What is the specific function of the structures contained in region F?

List one body structure that the germ layer at “A” (white) gives rise to.