Viral-blocking enzymes induced by interferon are activated only upon viral invasion of the cell
Indicate whether the statement is true or false
T
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What is the function of the gonads?
A) secrete fluids into the reproductive system ducts B) connect the uterus with the exterior C) receive and transport the gametes D) produce gametes and hormones E) enclose and support a developing embryo
Where are creatinine, ammonium ions, small amounts of urea, and drugs such as penicillin typically secreted?
A) collecting duct B) distal tubule C) proximal tubule D) ascending limb of the nephron loop (loop of Henle)
Describe the digestive tract wall
What will be an ideal response?
Why does breathing continue to be rapid and deep for a time after heavy exercise?
A. Extra oxygen is needed to eliminate lactic acid and restore muscle creatine phosphate and glucose concentrations. B. The respiratory system is slow to increase and decrease its function before and after exercise, which is why it takes awhile for breathing to slow down. C. Lactic acid that builds up during heavy exercise must be exhaled into the air, so heavy breathing must continue for awhile after exercise to eliminate it. D. The ATP level in muscle cells falls drastically during heavy exercise, and extra oxygen is needed to restore it. E. The extra ventilation is not needed to replenish energy stores in muscle fibers, but rather simply to restore the blood pH to normal after the production of excess lactic acid during the exercise.