Topics: Circulation and Excretion Quiz
Which of the following mechanisms are used to regulate blood pressure in the closed circulatory system of vertebrates?
A. changing force of the contraction of the heart
B. constricting and relaxing sphincters in the walls of arterioles
C. adjusting the volume of the blood in the veins
D. all the above
E. only a and b
Select your answer:

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Name that Pathogen › ViewI can also infect cattles and spread to humans in meat and milk.
A. TB
B. HIV/AIDS
C. Cholera
D. Malaria
Macromolecules and Enzymes › View
The monomer nucleotides, is the most complex of the macromolecules, which is the only macromolecule that includes the element phosphorus. What is its macromolecule?
A. Carbohydrates
B. Lipids
C. Nucleic Acids
D. Proteins