Qubain is poison that blocks the Na^/K^pump. If this pump is blocked, then the c
ID: 181942 • Letter: Q
Question
Qubain is poison that blocks the Na^/K^pump. If this pump is blocked, then the concentration of potassium inside the cell would: Increase Decrease Not Change Depend on the type of tissue None of the above. Which one of the following is most likely to cause an action potential to be generated? Two IPSPs An IPSP and an EPSP One EPSP Two EPSPs One IPSP. Excitatory post-synaptic potentials occur when a neurotransmitter engages a post- synaptic membrane receptor, resulting in the post-synaptic membrane becoming More permeable to Cl^- More permeable to K^+ Less permeable to Na^+ Less permeable to K^+ More permeable to Na^+ In which of the following would the velocity of nerve impulse conduction be the greatest? Large diameter unmyelinated fibers. Small-diameter unmyelinated fibers. Large-diameter myelinated fibers. Small-diameter myelinated fibers None of the preceding because they conduct impulse at the same velocity The Enzyme the Peroxisome of an animal cell is. Acetylcholinestrase Cathechol Methyl Oxidase. Catalase Amylase LipaseExplanation / Answer
Answer:
(22) B
Ouabain block the conformation of sodium-potassium pump thereby inhibiting inflow of potassium. The intracellular potassium ion concentration decreases due to influx of extracellular fluid inside cells
(23) D
EPSP (excitatory postsynaptic potential) facilitates action potential to be generated. The effects of multiple EPSPs are additive. So, two EPSPs is most likely to cause an action potential to be generated.
(24) E
Voltage gated ion channels are shut when the membrane potential reaches the resting phase but opens up immediately upon increase in membrane potential. Sodium ions flows through these channels increasing the membrane potential.
(25) C
Large-diameter myelinated fibers have the highest conduction velocity, partly due to the strong insulation.
(26) C
Peroxisomes contain catalases which reduces hydrogen peroxide in cells.