Which vitamin deficiency is the most common worldwide?
A. Vitamin B6 (pyridoxine)
B. Vitamin A
C. Vitamin C
D. Vitamin E
E. Vitamin D
Answer: B
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Of the three types of blood vessels, blood flows most slowly through the ________________________________________, allowing more time for the diffusion of oxygen, nutrients, and waste products
Fill in the blank(s) with correct word
Pupillary constriction results from contraction of the ________ muscle of the iris as a consequence of ________ stimulation
a. circular; sympathetic b. circular ; parasympathetic c. radial; sympathetic d. radial; parasympathetic e. suspensory; somatic motor
The pressure in the alveoli is known as __________.
A. intrapulmonary pressure B. intrapleural pressure C. transpulmonary pressure D. atmospheric pressure
Before external respiration occurs, the concentration or partial pressure of oxygen in the alveoli is ________ than in the pulmonary capillaries.
A. lower B. higher C. no different