The sodium level inside and outside of a resting cell is an example of the
A. kinetic energy of sodium rushing out of a cell down its concentration gradient.
B. kinetic energy of the large difference in sodium concentration on the inside versus the outside of the cell.
C. potential energy of a concentration gradient, because sodium is more abundant outside the cell.
D. potential energy of an electron transport chain, because sodium has an extra electron to donate.
E. conversion of potential energy to kinetic energy, because sodium can never move across the cell membrane and must move across its surface.
C
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Air flow in the respiratory system and blood flow in the cardiovascular system have many similarities–name them. How are they different?
What will be an ideal response?
countercurrent exchange system
Fill in the blank(s) with the appropriate word(s).
Which of the following is not an example of a digestive contractile activity?
a. peristalsis b. segmentation c. threshold contractions d. haustral contractions e. none of these
Which of the following blood types is incompatible for donation to A+?
A) A? B) O? C) B? D) O+