Which of the following statements about the Na+-K+ pump is incorrect?
a. Phosphorylation of the pump must occur before K+ can attach to its binding site.
b. It has ATP synthase activity.
c. It helps decrease Na+ and K+ concentration gradients across the plasma membrane.
d. It regulates cell volume by controlling the concentration of solutes inside the cell.
e. Its action is important for secondary active transport.
C
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The wound has become infected, probably with bacteria. The initial symptoms indicate acute inflammation. Pus indicates the presence of dead or dying neutrophils, broken-down tissue cells, and living and dead pathogens.
What will be an ideal response?
Which of these does not prevent the spontaneous formation of a clot?
A) The dilution of thrombin when blood flows at a normal rate B) The smooth prostacyclin-coated endothelium of blood vessels C) The presence of tissue thromboplastin D) The presence of antithrombin in plasma E) The presence of heparin in plasma
Stress can affect the immune response in all of the following ways except by
A) inhibiting glucocorticoid release. B) depressing the inflammatory response. C) reducing the number of phagocytes. D) inhibiting interleukin secretion. E) increasing the level of cortisol.
When the ions move across the cell membrane, an electrical potential change results. As you are probably aware, nerves trigger muscle movement. When you place your finger on a sharp object (such as a tack), you quickly draw your hand away and develop a sensation of pain. Which types of channels are operating under these conditions to allow nerve conduction and subsequent muscle movement?
What will be an ideal response?