Activity #12
CIRCULATORY SYSTEM
Student’s Name _________________________
Course/Year/Section _____________________
Instructor’s Name ________________________
I.
Date Performed _____________
Date Submitted _____________
Label the diagram of the frog's heart below:
Dorsal and Ventral View of Toad's Heart
II.
Guide Questions:
1. Heart
a. Why are the ventricles more muscular than the atria?
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b. What valve prevents the backflow of blood from conus arteriosus to
the ventricle?
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2. Venous System
a. How does the blood in the pulmonary vein differ from that in other
veins?
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b. Name the three veins that empty into the sinus venosus.
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3. Portal System
a. Trace the blood from the femoral veins of the leg to:
i. Kidney
ii. Liver
b. What visceral organ system uses the portal system extensively?
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4. Arterial System
a. Trace the shortest route a blood corpuscle could take in travelling
from the systemic arch to the intestine to the right atrium.
b. How does the blood in the pulmocutaneous arch differ from that in
the higher two aortic arches?
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