Normally, skin color results from a combination of
a: melanin
b: hemoglobin
c: bilirubin
d: carotene
A. a, b, d
B. a, c, d
C. a, d
D. a, b, c
E. b, c, d
A
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Sympathetic stimulation ____ heart rate and ____ the motility in the digestive tract
a. does not affect, decreases. b. decreases, decreases. c. decreases, increases. d. increases, decreases. e. increases, increases.
Match the cell membrane structure to its description: Gap junctions.
A)Buttonlike junctions that use linker proteins to hold adjacent cells together B)Adjacent cells joined by a line of membrane proteins that form an impermeable junction C)None of the listed responses is correct. D)Adjacent cells held together by connexon proteins that form cylinders allowing ion flow between the cells' cytoplasm
Ion movement across the plasma membrane creates an electrical charge difference known as ______
A. extracellular glycocalyx B. transcription C. respiration D. membrane potential
A solute, X, is placed in compartment A of a two compartment container and allowed to diffuse to compartment B and attain diffusion equilibrium. At that point in time,
A. solutes will only continue to move from B to A. B. there will be no further movement of any solute molecules between compartments. C. solutes will only continue to move from A to B. D. solutes will be moving in both directions equally. E. the concentration in compartment B will be much higher than that in compartment A.