Quiz 08 Posted Answers Deadline: Wednesday, March 26, 6 am (1 week extension due to Spring Break) 1. If a molecule diffusing through extracellular fluid travels 1 mm in 1 sec, how long will it take that molecule to diffuse 1 cm? (c) a. 10,000 sec b. 1,000 sec c. 100 sec d. 10 sec 2. It was always assumed that dinosaur hearts were like those of modern reptiles. However, a fossil of the dinosaur Tescelosaurus was found with unusually well preserved soft tissues. A computerized tomography scan revealed that this dinosaur’s heart had a complete partition dividing the left and right halves of the ventricle, and there was a single arched aorta. Which one of the following best describes the significance of these findings? (d) a. Pressure in the atria during atrial systole was probably higher than pressure in the ventricles during ventricular systole. b. The lack of a right systemic artery would have made it impossible for Tescelosaurus to hold its breath. c. Tescelosaurus was a direct ancestor of modern mammals.
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This note was uploaded on 06/23/2008 for the course BISC 220L taught by Professor Herrera,mcclure during the Spring '07 term at USC.