If you mixed a person's red blood cells with anti-B antibodies, and the red blood cells agglutinated, what could you conclude?
A. That the person's blood is Rh+
B. That the person has type AB blood
C. That the person has type B blood
D. That the person's red blood cell membranes contain antigen B
E. That the person's red blood cell membranes contain antigen A
Answer: D
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The ________ divides the aorta into the thoracic aorta and the abdominal aorta
A) pericardium B) mediastinum C) diaphragm D) peritoneum E) pleura
Why wasn't there a live low-train high group?
A study was done in 1998 by Dr. Benjamin Levine to explore the role of altitude training in athletic performance. First he trained athletes at low altitude, then measured their finish times in a 5 kilometer run. Then the athletes were placed into one of the following groups: I, living and training at high altitude; II, living at high altitude and training at low; or III, living and training at low altitude. The athletes were then retested in another low-altitude 5 K race. In this study, what are the control and experimental data? What are the dependent and independent variables? The results are expressed as average change in speed of each group. I: -3.4 sec., II: +13.4 sec., III: -26.7 sec. Graph and interpret the results. Did the results surprise you? Why or why not? Propose some explanations for the lower performance by the live high-train high group.
A local increase in potassium increases the vasodilation of arterioles
Indicate whether the statement is true or false
Neutrophils are most effective at:
A) antibody formation. B) fighting a bacterial infection. C) fighting a parasitic infection. D) fighting a viral infection.