All of the following are involved in the process of breathing EXCEPT which one?
A) bones
B) respiratory system
C) circulatory system
D) skeletal muscles
E) nervous system
C
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Treponema pallidum is extremely sensitive to temperature changes and low moisture, thus it is transmitted
A) by intimate person-to-person contact. B) by fomites. C) by vectors. D) through common sources such as food and water.
The last structure that air moves through in mammals
before entering the alveoli is (are) the a. larynx. b. bronchi. c. bronchioles. d. trachea. e. pharynx.
Which sentence best describes the situation that occurs when an enzyme and its substrate interact?
a. Just after substrate binding, the enzyme changes its shape (conformation) so that the active site becomes even more precise in its ability to bind the substrate. b. Just before substrate binding, the enzyme changes its shape (conformation) so that the active site becomes even more precise in its ability to bind the substrate. c. Just before substrate binding, the substrate changes its shape (conformation) so that the active site becomes even more precise in its ability to bind the enzyme. d. Just after substrate binding, the substrate changes its shape (conformation) so that the active site becomes even more precise in its ability to bind the enzyme.
What is true of the corpus luteum?
A. The major hormone secreted from the corpus luteum is LH. B. Secretions of the corpus luteum stimulate LH and FSH secretion. C. Secretions of the corpus luteum induce maturation of primary oocytes. D. The major hormone secreted from the corpus luteum is estradiol. E. Secretions of the corpus luteum prepare the uterus for implantation of the embryo.