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Try to explain the following observation...

Try to explain the following observations:
When `K^+` ions are removed from the medium surrounding red blood cells, sodium influx into the cells and potassium efflux increase dramatically.

Text Solution

Verified by Experts

A `Na^(+) // K^(+)` pump operates whereby efflux of `Na^+` is linked to influx of `K^+` without `K^+` , no `Na^+` efflux can occur , so `Na^+` accumulates within the cells by diffusion and `K^+` leaves the cells by diffusion.
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Knowledge Check

  • Read the given passage and answer the questions that follows: Rhodinus, a blood-sucking bug, shows five instars before it metamorphoses into an adult. It ahs a very long head with the brain located at tip and an organ called Corpora Cardiaca (C C) behind it. The hormone that ensures the continuum of the juvenile stages is called a juvenile hormone. Behind the head is a pro - thoracic gland, which gets triggered by the Pro - Thoracico - Tropic Hormone (PTTH) to release ecdysone required for molting into an adult. The following observations were made when the juveniles of this insect were subjected to various conditions : 1. Starved juveniles (any instar) when decapitated rarr remained juveniles and did not molt into adults. 2. Well-fed juveniles (any instar) when decapitated rarr molted into adults. 3. Starved juveniles (any instar) when partially decapitated to remove the brain cells rarr remained juveniles and did not molt into adults. 4. Well - fed juveniles (any instar) when partially deitated to remove the brain cells rarr did not molt into adults. If an unfed, completely decapitated, fth (final) instar juvenile is connected to a well-fed, decapitated fourth instar juvenile by a glass tube so that fluids can be exchanged, what whill be the expected result ?

    A
    Both bugs will continue to remain juveniles.
    B
    Both bugs will molt into adult forms.
    C
    The bug in the fourth instar will remain as a juvenile while the one in the fifth instar will molt into an adult.
    D
    The bug in the fourth instar will molt into an adult and the one in the fifth instar will remain as a juvenile.

  • Read the given passage and answer the questions that follows: Rhodinus, a blood-sucking bug, shows five instars before it metamorphoses into an adult. It ahs a very long head with the brain located at tip and an organ called Corpora Cardiaca (C C) behind it. The hormone that ensures the continuum of the juvenile stages is called a juvenile hormone. Behind the head is a pro - thoracic gland, which gets triggered by the Pro - Thoracico - Tropic Hormone (PTTH) to release ecdysone required for molting into an adult. The following observations were made when the juveniles of this insect were subjected to various conditions : 1. Starved juveniles (any instar) when decapitated rarr remained juveniles and did not molt into adults. 2. Well-fed juveniles (any instar) when decapitated rarr molted into adults. 3. Starved juveniles (any instar) when partially decapitated to remove the brain cells rarr remained juveniles and did not molt into adults. 4. Well - fed juveniles (any instar) when partially deitated to remove the brain cells rarr did not molt into adults. Which of the following conclusions can be drawn from this data ? (i) Ecdysone hormone is produced irrespective of the level of feeding. (ii) C C is the site of production of juvenile hormone. (iii) PTTH is produced irrespective of the level of feeding. (iv) Increase in juvenile hormone is an important trigger for production of PTTH. (v) Absence of C C alone is a trigger for molting into adult form. (vi) Well-fed larvae in absence of juvenile hotmone can molt into adults.

    A
    (i), (iii) (iv) and (v)
    B
    (ii), (iv) and (v)
    C
    (ii) and (vi)
    D
    (i) and (iv)

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