Dr Gawad Physiology Course Online Exam - Excitable - Lecture 1 (Introduction, Resting Membrane Potential)

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  • 1/7 Questions

    Isopotential means

    • More negative
    • More positive
    • Same potential
    • None of the above.
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7 MCQs (Only one correct answer)Each MCQ: 1 mark, Total mark: 7 Allowed time: 8 minGood Luck

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  • 2. 

    The main responsible ion for the negative RMP is

    • Na

    • K

    • Cl

    • HCO3

    Correct Answer
    A. K
    Explanation
    The correct answer is K (potassium). Potassium ions play a crucial role in establishing the negative resting membrane potential (RMP) in cells. Inside the cell, there is a higher concentration of potassium ions compared to the outside. This concentration gradient creates an electrochemical potential difference, leading to the negative RMP. The movement of potassium ions through specific channels helps maintain this negative charge, which is essential for various cellular processes, including nerve conduction and muscle contraction.

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  • 3. 

    The main cause of RMP is

    • Unequal distribution of ions

    • That it is totally dependant on a passive process

    • That it is totally dependant on active process

    • The osmotic power of Na

    Correct Answer
    A. Unequal distribution of ions
    Explanation
    The main cause of RMP, or resting membrane potential, is the unequal distribution of ions. This refers to the difference in concentration and distribution of ions, such as sodium (Na+), potassium (K+), and chloride (Cl-), inside and outside the cell. This unequal distribution creates an electrical charge across the cell membrane, resulting in a potential difference. This potential difference is essential for various cellular processes and the transmission of nerve impulses.

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  • 4. 

    RMP is due to which of the following:

    • Passive movements of ions along the membrane

    • Selective permeability of the membrane

    • Active Na and K transport

    • Impermeability of the membrane to protein

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The resting membrane potential (RMP) is due to a combination of factors. Passive movements of ions along the membrane contribute to the establishment of the RMP. The selective permeability of the membrane allows certain ions to pass through more easily than others, further influencing the RMP. Active transport of sodium (Na) and potassium (K) ions across the membrane also plays a role in establishing and maintaining the RMP. Additionally, the impermeability of the membrane to proteins contributes to the RMP. Therefore, all of these factors together contribute to the resting membrane potential.

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  • 5. 

    According to the active (Na-K) pump:

    • A trans membrane protein showing large number of binding sites on its interior aspect

    • Inner ATPase activity is concerned to produce conformational change followed by 2 K+ pumped inside

    • Ions migrate uphill against both (concentration + electrical) gradient

    • Binding of (Na – K) to their respective binding sites is followed by activation of the inner ATPase

    • All is true

    Correct Answer
    A. All is true
    Explanation
    The given statement suggests that all the statements mentioned are true. According to the active (Na-K) pump, there is a transmembrane protein with a large number of binding sites on its interior aspect. The inner ATPase activity is responsible for producing a conformational change, which leads to the pumping of 2 K+ ions inside. The ions migrate uphill against both the concentration and electrical gradient. The binding of (Na-K) to their respective binding sites activates the inner ATPase. Therefore, all the statements mentioned in the question are true.

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  • 6. 

    Regarding K transportation during RMP

    • It is slower than Na

    • It is limited by the positivity of the outer membrane

    • It is from outer to inner surface by active process

    • It is as the same amount of Cl movement

    Correct Answer
    A. It is limited by the positivity of the outer membrane
    Explanation
    The correct answer suggests that the transportation of K during RMP is limited by the positivity of the outer membrane. This implies that the movement of K ions is influenced by the positive charge on the outer membrane, which acts as a barrier or restriction for the transport process. This limitation could potentially affect the overall speed or efficiency of K transportation during RMP.

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  • 7. 

    The main cause of negative RMP is

    • K outflux

    • Na inflow

    • Membrane imperbeability to protien

    • None of the above

    Correct Answer
    A. Membrane imperbeability to protien
    Explanation
    The correct answer is "membrane impermeability to protein". The resting membrane potential (RMP) is the electrical potential difference across the cell membrane when the cell is at rest. It is mainly maintained by the movement of ions across the membrane. In this case, the impermeability of the membrane to protein means that proteins cannot freely move across the membrane, which can disrupt the balance of ions and result in a negative RMP. The other options, K outflux and Na inflow, can contribute to changes in the RMP but are not the main cause of a negative RMP.

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  • Feb 16, 2017
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