Schistosomiasis involves
A. a blood fluke.
B. a life cycle stage which continues when eggs from humans enter water and develop into miracidia.
C. cercariae which penetrate hair follicles and pass to the blood and then the liver.
D. snails which enable development of the parasite into cercaria.
E. All of the choices are correct.
Answer: E
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Spongiform encephalopathy occurs in
A. humans. B. cattle. C. sheep. D. All of the choices are correct.
Why does countercurrent exchange optimize gas exchange across some gills?
a. It sustains an optimal thermal environment for gas exchange. b. It optimizes perfusion to the respiratory surface. c. It sustains an optimal respiratory gas concentration gradient, allowing diffusion to occur across the entire respiratory surface. d. It optimizes delivery of the respiratory medium to the respiratory surface. e. It minimizes the area of diffusion.
Classifying pneumonia based upon where it was contracted (for example, community-acquired pneumonia) is done to assist with tracing the source of an outbreak
Indicate whether the statement is true or false
Bacteria in our mouths feed off the sugars in foods that we eat. As these bacteria ferment the sugars, they generate a product that can cause dental cavities. What is this product?
A) Lactic acid B) Citric acid C) Acetyl CoA D) Hydrochloric acid E) Pyruvate