The countercurrent heat exchanger that prevents arterial blood from overheating the testes is the ________.
A. pampiniform plexus of veins
B. scrotal portal system
C. blood-testis barrier
D. rete testis
E. epididymis
Answer: A
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An increase in the rate of red blood cell production is indicated in the blood by:
A. a decrease in the reticulocyte count B. an increase in the reticulocyte count C. no change in the reticulocyte count
Answer the following questions true (T) or false (F)
1. The return of calcium ions to the sarcoplasmic reticulum during muscle relaxation decreases the calcium ion concentration in the cytosol. 2. Creatine phosphate provides 30-40 seconds of energy for muscle activity. 3. Greater muscle tension results when muscle fibers are repeatedly stimulated.
Under normal conditions, what is the response to an increase in thyrotropin-releasing hormone (TRH)?
A) increase in thyroid-stimulating hormone (TSH) production B) decrease in thyroxine (T4 ) production C) increase in growth hormone production D) decrease in triiodothyronine (T3 ) production
The hormone(s) that may be slowly administered by intravenous drip to accelerate labor and delivery is/are
A) oxytocin. B) prolactin. C) luteinizing hormone. D) oxytocin and luteinizing hormone.