Which is representative of early prophase?
A)The chromatids separate at the centromere.
B)The cell membrane dissolves.
C)The chromatids return to chromatin form.
D)Chromosomes condense as sister chromatid pairs
D)Chromosomes condense as sister chromatid pairs
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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.
Long bones increase in width and other bones increase in size or thickness because of ______ growth beneath the periosteum.
a. interstitial b. appositional
The general senses
A) involve receptors that are relatively simple in structure. B) are located in specialized structures called sense organs. C) are localized to specific areas of the body. D) cannot generate action potentials. E) are limited to the skin.
Which of the following INCORRECTLY describes mechanisms of CO2 transport?
A) as bicarbonate ions in plasma B) 7-10% of CO2 is dissolved directly into the plasma C) just over 20% of CO2 is carried in the form of carbaminohemoglobin D) attached to the heme part of hemoglobin