The advantages of a four-chambered heart is that it __________
a. prevents mixing of oxygenated and deoxygenated blood
b. prevents deoxygenated blood from entering the heart
c. allows better flow of blood to the tissues
d. prevents mixing of oxygenated and deoxygenated blood and allows tissues to be bypassed
e. prevents mixing of oxygenated and deoxygenated blood and allows better flow of blood to
the tissues
E
You might also like to view...
Allopatric speciation is most commonly caused by
a. geographical distance. b. the unattractiveness of the females. c. a heavy parasite load. d. rapid genetic exchange over long distances. e. increased genetic drift.
Chronosequences are useful because one can
A) view several taxa in one sere. B) view several seres in one region. C) measure the impacts of disturbance. D) count the number of trees in one sere.
Arrange the events of a second messenger system in the correct order
1) Protein kinase is activated. 2) G protein is activated. 3) The neurotransmitter binds to its receptor. 4) The protein closes the potassium channel. 5) Cyclic AMP is produced. 6) Phosphorylation takes place. a. 1 ? 2 ? 5 ? 6 ? 4 ? 3 b. 3 ? 5 ? 6 ? 1 ? 2 ? 4 c. 5 ? 2 ? 6 ? 1 ? 3 ? 4 d. 3 ? 2 ? 5 ? 1 ? 6 ? 4 e. 5 ? 2 ? 6 ? 1 ? 4 ? 3
_____________ send signals that control muscles and glands.
Fill in the blank(s) with the appropriate word(s).