An isotonic solution
A) has more water entering than leaving a cell.
B) has a greater concentration of solute particles than a cell.
C) has the same osmotic pressure as the cells in the solution.
D) causes a cell to shrink.
C
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Compartments A and B are separated by a membrane that is permeable to K+ but not to Na+ or Cl-. At time zero, a solution of KCl is poured into compartment A and an equally concentrated solution of NaCl is poured into compartment B. Which would be true once equilibrium is reached?
A. Diffusion of K+ from A to B will be greater than the diffusion of K+ from B to A. B. The electrical potential difference and diffusion potential due to the concentration gradient for K+ will be equal in magnitude and opposite in direction. C. The concentration of Cl- will be higher in B than it was at time zero. D. The concentration of Na+ in A will be higher than it was at time zero. E. There will be a potential difference across the membrane, with side B negative relative to side A.
A surgical incision parallel to the lines of cleavage
A) closes and heals with relatively little scarring. B) has a tendency to reopen. C) heals slower than incisions made perpendicular to the lines of cleavage. D) does not affect the healing process. E) requires no sutures.
Which is the most common immunoglobulin for allergies?
A) IgA B) IgE C) IgD D) IgG
Identify the ways in which the anterior pituitary differs from the posterior pituitary. Check all the apply.
A. The anterior pituitary is also known as the adenohypophysis. B. The posterior pituitary secretes gonadotropins. C. The anterior pituitary is stimulated by the hypothalamus via hormones that travel through the hypophyseal portal system. D. Oxytocin is secreted by the anterior pituitary. E. Cell bodies in the hypothalamus synthesize hormones that pass down the hypothalamo-hypophyseal tract and are stored in the posterior pituitary.