What ions determine the resting potential of a nerve? a) sodium and calcium b) calcium and copper c) potassium and calcium d) sodium and potassium

What ions determine the resting potential of a nerve? a) sodium and calcium b) calcium and copper c) potassium and calcium d) sodium and potassium
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ANSWER: D -- SODIUM AND POTASSIUM
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The resting potential of a neuron is dependent on what two ions? a) lead and calcium ions b) calcium and phosphate ions c) sodium and potassium ions d) potassium and phosphate ions

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Procainamide differs from quinidine in the following respect (a) It does not cause paradoxical tachycardia (b) It has no alfa adrenergic blocking activity (c) It has little antivagal action (d) Both (b) and (c) Ans: D 68. In heart, potassium channels determine (a) Pacemaker function (b) Resting potential (c) Action potential duration (d) All of the above

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The sodium/potassium pump is primarily responsible for the: a) resting potential b) action potential c) excretion of salts d) contraction of muscle fibers

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During the nerve impulse transmission, following ion or ions may play significant roles D A. Sodium B. Potassium C. Chloride D. All of these

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During the nerve impulse transmission, following ion or ions may play significant roles D A. Sodium B. Potassium C. Chloride D. All of these

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The two metal ions that cause hardness to water are: (1) Calcium, Magnesium (2) Sodium, Calcium (3) Sodium, Potassium (4) Sodium, Magnesium

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The two metal ions that cause hardness to water are: (1) Calcium, Magnesium (2) Sodium, Calcium (3) Sodium, Potassium (4) Sodium, Magnesium

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The following are true about an action potential in a nerve fibre: a. it occurs when its membrane potential is hyperpolarized b. it is associated with a transient increase in membrane permeability to sodium c. there is a decreased in membrane permeability to potassium d. it has an amplitude which varies directly to the strength of stimulus

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The resting potential in nerves is produced by difference in a. ions b. charges c. both d. none of them

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During the propagation of a nerve impulse, the action potential results from the movement of (a) K+ ions from intracellular fluid to extracellular fluid (b) Na+ ions from extracellular fluid to intracellular fluid (c) K+ ions from extracellular fluid to intracellular fluid (d) Na+ ions from intracellular fluid to extracellular fluid.

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The conduction velocity of the nerve fibres is increased by: a. decreased temperature b. increased concentration of the external sodium ions e. increased axon diameter d. myelination

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Sodium ions are "pumped" from a region of lower concentration to a region of higher concentration in the nerve cells of humans. This process is an example of (A) Diffusion (B) Passive transport (C) Osmosis (D) Active transport

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Use of an artificial kidney during hemodialysis may result in (A) Nitrogenous waste build-up in the body (B) Non-elimination of excess potassium ions (C) Reduced absorption of calcium ions from gastro-intestinal tract (D) Reduced RBC production. Which of the following options is the most appropriate ? (a) (A) and (D) are correct. (b) (A) and (B) are correct. (c) (B) and (C) are correct. (d) (C) and (D) are correct.

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Stomata of a plant open due to (a) influx of potassium ions (b) efflux of potassium ions (c) influx of hydrogen ions (d) influx of calcium ions.

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In the neurone: a. the magnitude of the action potential is dependent on the strength of the stimulus b. impulses can travel in both direction c. depolarization is accompanied by increased permeability of the cell membrane to potassium ions d. during depolarization, the potential of the neurone changes from -70mV to +40mV

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The following are true about rods in darkness: a. there is tonic release of neurotransmitters b. the sodium ion channels are open c. the potassium ion channels are shut d. there is a net influx of sodium ions

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Human urine is usually acidic because (a) potassium and sodium exchange generates acidity (b) hydrogen ions are actively secreted into the filtrate (c) the sodium transporter exchanges one hydrogen ion for each sodium ion, in peritubular capillaries (d) excreted plasma proteins are acidic.

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Do the positive charges of calcium ions and sodium ions make these ions more likely to move into or out of the cell?

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When a neuron is in resting state i.e., not conducting any impulse, the axonal membrane is (a) comparatively more permeable to Na+ ions and nearly impermeable to K+ ions (b) equally permeable to both Na+ and K+ ions (c) impermeable to both Na+ and K+ ions (d) comparatively more permeable to K+ ions and nearly impermeable to Na+ ions.

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Local anesthetics: A. Inhibit transmission of nerve impulses by increasing sodium membrane permeability and the displacement of ionized calcium. B. Are classified as amides or esters. C. Produce peripheral vasodilation. D. Are weak acids.

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A resting nerve is relatively resistant to blockade by lignocaine compared to one which is repeatedly stimulated because: A. Lignocaine penetrates resting nerve membrane poorly B. Lignocaine binds more avidly to the inactivated Na+ channel C. Nerve impulse promotes ionization of lignocaine D. Nodes of Ranvier are inaccessible in the resting state

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Minerals known to be required in large amounts for plant growth include (a) potassium, phosphorus, selenium, boron (b) magnesium, sulphur, iron, zinc (c) phosphorus, potassium, sulphur, calcium (d) calcium, magnesium, manganese, copper.

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During Phase 2 of action potential in cardiac cell, depolarizing current through calcium channels is balanced by (a) Delayed rectifier potassium current (b) outward chloride channel (c) Both (a) and (b) (d) None of the above

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What are the differences and purposes of the different types of ice melt such as sodium chloride, potassium chloride, calcium chloride and blends?

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The principal cation in intracellular fluid is (A) Sodium (B) Potassium (C) Calcium (D) Magnesium

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The principal cation in extracellular fluid is (A) Sodium (B) Potassium (C) Calcium (D) Magnesium

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The mineral present in the human body in larger amounts than any other cation is (A) Sodium (B) Calcium (C) Potassium (D) Iron

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