★ Circulatory / Respiratory Quiz
What causes the semilunar valves to open?
A. contraction of the ventricles
B. contraction of the atria
C. stimulation of the SA node
D. backflow of blood in the aorta and pulmonary artery during diastole
E. contraction of the cardiac muscle that makes up the valves
Select your answer:
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Biology › ViewWhat does the word root “Bio” mean?
A. Life
B. Living
C. Existing
D. Moving
Nucleic Acids › View
Double ring N base
A. Purine
B. Pyrimidine