During depolarization a. Membrane potential is becoming less negative due to an

Question

During depolarization a. Membrane potential is becoming less negative due to an influx of sodium ions b. Membrane potential is becoming more negative due to an influx of sodium ions c. Membrane potential is becoming less negative due to an influx of potassium ions Membrane potential is becoming more negative due to an influx of potassium ions Which of the following ranks these three gas exchange methods from least efficient to most efficient? a. Countercurrent, concurrent, crosscurrent b. Concurrent, crosscurrent, countercurrent c. Crosscurrent, countercurrent, concurrent d. Countercurrent, crosscurrent, concurrent In the male reproductive system, leutenizing hormone a. Develops the sertoli cells b. Stimulates the Leydig cells to produce testosterone d. Stimulates the sertoli cells to produce sperm The location where filtration occurs in the kidney is the a. proximal Convoluted Tubule b. Glomerulus c. Renal Pelvis d. Distal Convoluted Tubule e. Collecting Duct

Explanation / Answer

(11) (a) Membrane potential becoming less negative due to an influx of sodium ions.

When a neuron is stimulated, the stimulus causes sodium channels to open. sodium ions rush into the neuron. Inside of the cell becomes more positive as sodium ions rushes in. Membrane potential becomes less negative. It is called depolarization.

(12)

(d)Countercurrent crosscurrent concurrent

In countercurrent exchange the solutions are arranged so that flow takes place in opposite directions and opportunity for exchange can be maximised.

(13)b. stimulates Leydig cell production of testosterone.

(14)

B. glomerulus

The glomerulus filters blood and produces glomerular filtrate.

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