Blood returning to the mammalian heart in a pulmonary vein drains first into the _____
A) vena cava
B) left atrium
C) right atrium
D) left ventricle
E) right ventricle
Answer: B
You might also like to view...
One of the limiting factors in engineering plants for nitrogen fixation is to prevent the binding of ________ to the enzyme nitrogenase and the subsequent inhibition of the enzyme.
A. calcium B. bacteria C. oxygen D. phosphorus E. cell membranes
Which theory explains how hydrogen bonding allows water molecules to maintain a continuous fluid column as water is pulled from roots to leaves?
a. pressure flow b. evaporation c. cohesion-tension d. abscission e. fusion
Refer to the accompanying figure. Which of these lungs would be best for an animal that is fairly active?
a. 1 b. 2 c. 3 d. 4 e. Any of these.
Which of the following mechanisms of succession involves the establishment of species independently of the presence or absence of other species?
A) facilitation B) inhibition C) tolerance D) none of the above