Question

Human Physiology! Please help.

Case Study: Mrs. Nguyen has high blood pressure. Her physician puts her on a medication that increases her urine flow rate (a diuretic) to help reduce her blood pressure. A side effect of this medication is that her plasma (ECF)K concentration drops from 4mM to 2.5 mM. 1. Using just the values for Na" and K' and assuming that her neurons are 25 times more permeable to potassium than to sodium, what is her neuron membrane potential(V )? 2. Compare that to a normal neuron resting membrane potential. Are her cells hyperpolarized, no difference, or depolarized relative to a normal neural membrane potential of -70 mV 3. If the threshold voltage for an action potential is-55mV, how strong of an excitatory gaded potentialis needed to trigger an action potential? 4. Are Mrs. Nguyen's neurons more or less likely to respond to a stimulus compared to a normal neuron? 5. What is the term used to describe lower than normal plasma potassium concentrations? The physician prescribes a potassium supplement for Mrs. Nguyen, who decides that if two pil are good, four 6. What is her new neural membrane potential? 7. Compare that to a normal neuron resting membrane potential. Are her cells hyperpolarized, no difference, or depolarized relative to a normal neural membrane potential of -70 mV 8. If the threshold voltage for an action potential is -5SmV, how strong of an excitatory graded potential is needed to trigger an action potential? 9. Are Mrs. Nguyen's neurons more or 10. What is the term used to describe higher than normal plasma potssium concentrations?

Answer 1

Q. No. 5 Answer :

The lower than the normal potassium concentration level called " hypokalemia"

That is below 3.5 m. Mol per liter.

Q. No 6. Answer :

The new neural membrane potential is positive, because here less gate way open of the potassium ions.

Q. No 9. Answer:

Mrs. Nguyens neuron more likely respond to a stimulus compared to a normal neuron.

Q. No 10. Answer :

The higher than normal plasma potassium concentration level we can called " hyperkalemia"

That is above 5.0 m. Mol per liter.

The normal level of potassium is 3.5 - 5.0 mmol per liter.