Which of the following might trigger erythropoiesis?
A) hypoxia of EPO-producing cells
B) decreased tissue demand for oxygen
C) an increased number of RBCs
D) moving to a lower altitude
A) hypoxia of EPO-producing cells
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The male voice tends to be in a lower range than a female's voice because men have
A. more taut vestibular folds. B. more air to push through the rima glottidis. C. wider arytenoid cartilages. D. shorter and fatter vestibular ligaments. E. longer and thicker vocal folds.
Answer the following statement(s) true (T) or false (F)
1. Free nerve endings serve as receptors for temperature and pain, and are therefore classified as sense organs. 2. Sensory receptors sense only stimuli external to the body, such as light, sound waves, smell, and touch. 3. Olfaction results from the stimulation of chemoreceptors. 4. Taste signals travel from the tongue through the facial and glossopharyngeal nerves.
Which of the following statements concerning hemoglobin is correct?
a. the presence of hemoglobin keeps the blood PO2 low and favors O2 movement into the blood despite a very large transfer of O2 until hemoglobin is completely saturated. b. hemoglobin can combine with O2, CO2, H+, and CO. c. hemoglobin unloads more O2 in the presence of increased tissue acidity. d. hemoglobin buffers against changes in pH due to respiratory carbonic acid. e. all of these answers.
The pubic symphysis is made mostly of
A. hyaline cartilage. B. elastic cartilage. C. collagen fibers. D. fibrocartilage.