Which prenatal structure forms the ascending aorta and pulmonary trunk?
A. Truncus arteriosus
B. Sinus venosus
C. Primitive atrium
D. Primitive ventricle
E. Conus cordis
A
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Under certain conditions, the vocal folds act as a sphincter that prevents air passage
Indicate whether the statement is true or false
Secretion of the parathyroid hormone is regulated by blood levels of:
A) sodium. B) calcium. C) potassium. D) phosphorus.
All of the following is a function of tears except
A) lubricates the eye. B) washes away debris. C) provides oxygen. D) nourishes the cornea and conjunctiva. E) maintains acidic environment.
Which of the following is most important for the determination of stimulus type?
A. the relative sensitivity of different receptors to different stimulus energies B. the presence of polymodal neurons in the sensory pathway C. the intensity of a stimulus D. the location on the body where a stimulus is applied E. propagation of a signal along a nonspecific ascending pathway