During the absolute refractory period, a stimulus of high intensity may trigger a nerve impulse.
Answer the following statement true (T) or false (F)
False
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The bicarbonate system is composed of H2CO3 and HCO3-. Which statement accurately describes these molecules?
A. H2CO3 and HCO3- are both weak acids. B. H2CO3 is a weak acid, and HCO3- is a weak base. C. H2CO3 is a weak base, and HCO3- is a weak acid. D. H2CO3 and HCO3- are both strong bases. E. H2CO3 is a strong base, and HCO3- is a weak acid.
What is the correct order of structures through which air flows into the respiratory tract?
A. Larynx; pharynx; trachea; bronchioles; bronchi B. Pharynx; larynx; trachea; bronchi; bronchioles C. Larynx; pharynx; trachea; bronchi; bronchioles D. Larynx; pharynx; bronchi; trachea; bronchioles E. Pharynx; trachea; larynx; bronchi; bronchioles
It takes approximately ________ of aerobic exercise to begin mobilizing fats from adipose tissue.
A) 30 seconds B) 10 minutes C) 60 minutes D) 30 minutes E) 45 minutes
Which of the following statements concerning control of ovarian hormone secretion is incorrect?
a. Low levels of estrogen inhibit the hypothalamus and anterior pituitary in negative-feedback fashion. b. Under the influence of estrogen from developing follicles, FSH and LH secretion both continue to decline throughout the follicular phase. c. Both estrogen and progesterone are required to completely inhibit tonic LH secretion. d. A high level of estrogen stimulates LH secretion and initiates the LH surge. e. Progesterone powerfully inhibits both FSH and LH secretion.