Papillary muscles:
A. contract when the ventricles relax
B. prevent the valves from closing during ventricular diastole
C. are attached to the semi lunar valves via the chordae tendineae
D. prevent the backflow of blood into the atria during ventricular systole
E. prevent the backflow of blood into the ventricles from the aorta
Ans: D. prevent the backflow of blood into the atria during ventricular systole
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All of the following statements about initiation and transmission of action potentials in neurons are correct EXCEPT:
A. The rate of transmission of an action potential is directly related to the diameter of the axon. B. Information about the intensity of a stimulus is conveyed by changes in the size of the action potential generated. C. The resting potential is maintained by differential ion permeabilities and the sodium-potassium pump. D. Once initiated, local depolarizations stimulate a moving wave of depolarization down the axon. E. A stimulus to the neuron can either depolarize or hyperpolarize the neuronal membrane.
Which marine ecosystem has the highest mean net primary productivity?
a. continental shelf b. estuaries c. kelp beds and reefs d. open ocean e. upwelling zones
Which of the following evidence obtained from fossil studies is generally accepted as marking the beginning of the hominids?
A. Manufacture and use of tools B. Large brain development C. Walking upright D. Bipedalism E. Development of lower limbs longer than forelimbs
During a visit to her doctor, a woman pointed out a red rash that occurred just under her breasts. The doctor collected a scraping of the affected area, suspended the scrapings in potassium hydroxide, and then examined it microscopically. Upon viewing, she detected budding yeast cells and pseudohyphae. What is the most likely diagnosis?
A. Subcutaneous mycosis B. Dermatophyte infection C. Yeast infection - candidiasis D. Yeast infection - cryptococcosis