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Consider an axon of a neuron. At time=t1, its voltage is at threshold for an action potential; at time=t2, its voltage is at 0 millivolts prior to the peak of that action potential. In the time period between t1 and t2 of that single action potential,
A. the amount of intracellular sodium decreases.
B. sodium conductance of the voltage-gated sodium channels increases as membrane voltage increases.
C. sodium conductance of the voltage-gated sodium channels changes with a faster time course than potassium conductance of the voltage-gated potassium
Regulation of Heart The number of electrical impulses initiated by the SA node is primarily the result of its innervation by fibers from both sympathetic and parasympath
PO L YTEN E CHROMOSOMES First seen by Balbiani in salivary glands of larva of Chironomus insect (belongs to order Diptera). Later on such chromosomes observed in severa
Skeletons of radiolarians The skeletons of radiolarians and foraminiferans form a primary constituent of ocean bottoms where they form 30% or more of the sediment. It is calle
Generalised Seizures Generalised seizures are bilaterally symmetrical without focal onset. One subtype, the grand mal attack, is characterised by loss of consciousness and by s
Define Can we improve the nutritive value of protein? Yes, as discussed above, the nutritive value of a protein can be improved in two ways: (1) by mutual supplementation, that
Countercurrent flow is the arrangement by which fish get oxygen from the water which flows by the help of their gills. The water flows across the respiratory surface of the gill i
Q. Describe the effects of insulin on carbohydrate metabolism? Insulin promotes muscle glucose uptake and metabolism. In presence of insulin muscle cells take up glucose and us
Treatment and Nursing Management The initial treatment is surgical repair of the cleft. The timing of the repair varies from surgeon to surgeon, but most prefer cleft lip rep
What are the extraembryonic membranes present in vertebrates? The extraembryonic membranes that might be present in vertebrates are the yolk sac, the amnion, the chorion, the
Wigs and hairs - Seed Appendages Seeds of certain plants have epidermal outgrowths or the integuments themselves may form folds and projections that present a wing-like appea
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