The sodium-potassium pump pumps outsodium ions for every ions that are pumped in
ID: 3478025 • Letter: T
Question
The sodium-potassium pump pumps outsodium ions for every ions that are pumped in. 18. potassium 19· The sodium-potassium pump A. creates the membrane potential B. maintains the membrane potential 20. The movement of ions across the neuronal membrane creates an electrical signal called a potential. These potentials vary in amplitude and travel only a short distance. Thus they are very different from action potentials. The brain region(s) that is/are identifiable by its folds and grooves is the A) cerebellum only B) cerebrum only. C) medulla oblongata only D) cerebellum and cerebrum. E) cerebrum and medulla oblongata. 21. 22. Which phase of the action potential does the diagram below best correspond to? VOLTAGE-GATED NA+ CHANNELS VOLTAGE-GATED K+ CHANNELS A. depolarization B. peak C. repolarization D. hyperpolarizationExplanation / Answer
18. Sodium potassium pump pumps out _3___ sodium ions for every ___2_ potassium ions that are pumped in.
19. The sodium potassium pump B ) maintains membrane potential
20. The movement of ions across the neuronal membrane creates an electrical signal called resting potential.
21. The brain regions identifiable by grooves and folds are :
Cerebellum and cerebrum
(Fold allow accumulation of more neurons to allow more stimulation and message conduction)
22. Depolarisation
Reasons:
Sodium potassium agted channels play important role in generation of nerve impulse which can be divided into four stages:
Resting Potential: Oustide of the membrane is positive than compared to inside because of Sodium, potassium and protein anions distribution.
Depolarisation and generating action potential i.e peak potential. It shows changes in sodium and potassium permeability to generate the impulse. In beginning more permeable to allow sodium movement inside. After peak potential allows potassium movement outside.
Reploarisation: here Sodium Potassium pump operates to redistribute Na and K ions to maintain normal ionic distribution.
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