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TLS Online TPP Program

#Question id: 7147

How does lateral inhibition work to specify individual neurons in the neural epithelium of invertebrates and vertebrates?

#Unit 5. Developmental Biology
  1. Prospective neurons first arise in a cluster, but then, by chance, one cell will come to signal more strongly through Delta and Notch than its neighbors and become the only neuron in the cluster, by inhibiting its neighbors' specification as neurons.
  2. Stripes of prospective neurons will inhibit formation of neurons in stripes lateral to themselves.
  3. A gradient of inhibition spreads from the cells lateral to the neural epithelium, inhibiting their specification of neurons until a threshold is reached, at which point a single neuron is permitted to develop.
  4. Only one cell in each cluster of prospective neurons is fated to become a neuron, and it does so by inhibiting neural development in its lateral neighbors.
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TLS Online TPP Program

#Question id: 12303

#Unit 7. System Physiology – Animal

Which of the following changes would you expect to find in a dehydrated person deprived of water for 24 hours?
TLS Online TPP Program

#Question id: 12304

#Unit 7. System Physiology – Animal

Which of the following changes would you expect to find after acute administration of a vasodilator drug that caused a 50% decrease in renal efferent arteriolar resistance and no change in afferent arteriolar resistance or arterial pressure? 
TLS Online TPP Program

#Question id: 12305

#Unit 7. System Physiology – Animal

Which of the following would be expected to cause a decrease in extracellular fluid potassium concentration (hypokalemia) at least in part by stimulating potassium uptake into the cells?
TLS Online TPP Program

#Question id: 12306

#Unit 7. System Physiology – Animal

 Which of the following is true of the tubular fluid that passes through the lumen of the early distal tubule in the region of the macula densa?
TLS Online TPP Program

#Question id: 12307

#Unit 7. System Physiology – Animal

If a person has a kidney transport maximum for glucose of 350 mg/min, a GFR of 100 ml/min, a plasma glucose of 150 mg/dL, a urine flow rate of 2 ml/min, and no detectable glucose in the urine, what would be the approximate rate of glucose reabsorption, assuming normal kidneys?
TLS Online TPP Program

#Question id: 12308

#Unit 7. System Physiology – Animal

 Which of the following statements is correct?