What structural feature of the brain regulates the movement of materials from the blood into the brain?
A. Meninges
B. Blood-brain barrier
C. Myelin sheath
D. Circle of Willis
Answer: B
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The most important metabolic fuel molecule in the body is
A) sucrose. B) caffeine. C) protein. D) vitamins. E) glucose.
Which pressure is the result of the natural tendency of the lungs to decrease their size (because of elasticity) and the opposing tendency of the thoracic wall to pull outward and enlarge the lungs?
A. intrapulmonary pressure B. atmospheric pressure C. intrapleural pressure
Which bone articulates in the acetabulum?
A. Femur B. Humerus C. Calcaneus D. Tibia
In male urethral catheterization:
A) the diameter of the urethra at the external urethral orifice is narrower than at any other point. B) the urethra is least protected (most likely to rupture) at the bulb. C) the intermediate (membranous) segment is the most distensible part of the urethra. D) the location of the ducts of the bulbourethral glands must be identified in order to avoid injuring the glands. E) the patient is likely to feel the most discomfort (sharpest pain) when the catheter penetrates the prostatic urethra.