Medical Quiz

Circulation and Excretion Quiz

Water across the gills of fish and the blood in the gills does in opposite direction enhancing the diffusion of oxygen from the water into the blood. What is this flow in the opposite direction called?

A. undirectional flow

B. countercurrent exchange

C. atriventricular exchange

Select your answer:
A  B  C  D  E 


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Other quiz: Tutor Oral Biology

A patient presented with a full permanent dentition, except for the third molars. On the right side of the dental arch, the mesiobuccal cusp of the upper first molar occludes into the embrasure between the lower first molar and second premolar. Classify the molar relationship.

A. Class I

B. Class II

C. Class II division I

D. Class III

E. Unclassified