When examining the effect of a local anaesthetic on a nerve bundle, which of the

Question

When examining the effect of a local anaesthetic on a nerve bundle, which of the following could be used as a valid negative control? A The first response produced after anaesthetic is applied B The response produced before anaesthetic is applied C The response produced after anaesthetic and cold shocks are both applied D The response after anaesthetic has taken full effect E A negative control is not possible for this experiment [2 marks] 31391] The duration of a compound action potential is defined as A the time between the fastest individual action potential passing under the first recording [2 marks] electrode and the fastest travelling action potential passing under the second recording electrode the time between applying the stimulus and the fastest traveling individual action potential passing under the first recording electrode the time between the fastest individual action potential passing under the first recording electrode and the slowest travelling action potential passing under the second recording electrode B C D the time between applying the stimulus and the fastest travelling individual action potential passing under the second recording electrode the number of individual action potentials passing under the first recording electrode E 34075 Which of the following is one of the reasons why a larger than normal stimulus is required to generate a second action potential during the relative refractory period? A AllK channels are closed B Voltage-sensitive Na channels are still open C Stores of acetylcholine have been depleted D The threshold value of membrane potential is higher E K leaving the cell is acting to decrease the membrane potential [2 marks] 30734] Which of the following are two biological processes which can increase the force of a muscle contraction? A mechanical summation and recruiting more motor units B recruiting more motor units and decreasing sarcoplasmic reticulum Ca2 stores C mechanical summation and increasing acetylcholine release at the neuromuscular [2 marks] junction recruiting more motor units and increasing acetylcholine release at the junction D al summation and decreasing sarcoplasmic reticulum Ca stores

Explanation / Answer

Hi Answer:

1.Examine the effect of a local anesthetic on a nerve bundle which of the following could be used as a valid negative control?

Answer: Option E (A negative control is not possible for this experiment)

Explanation: In this experiment, only positive control can be used only and the positive control will be the first response produced after the anesthetic is applied.

2. The duration of a compound action potential is defined as

Answer: Option C (The time between the fastest individual action potentials passing under the first recording electrode and the slowest traveling action potentials passing under the second recording electrode)

3. Which of the following is one of the reasons why a larger than normal stimulus is required to generate a second action potential during the relative refractory period?

Answer: Option E (K+ leaving the cell is acting to decrease the membrane potential)

Explanation: K+ leaving the cell is acting to decrease the membrane potential which causes the hyperpolarization of the membrane potential due to that larger than normal stimulus is required to generate a second action potential during the relative refractory period.

4. Which of the following are two biological processes which can increase the force of a muscle contraction?

Answer: Option A (Mechanical summation and recruiting more motor units)

Explanation: Mechanical summation and recruiting more motor units to increase the contractile strength of the muscles due to that muscle develop more force.

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