Standing still and at attention for long periods can result in inadequate venous return. The effects of this can be seen when even young and healthy soldiers sometimes faint when standing at attention for long periods. Which of the following is NOT occurring to promote return of blood from the venous system in this situation?
A. one way flow in the venous system due to valves
B. sympathetic activation of smooth muscle in large veins
C. skeletal muscle activity compressing veins and forcing blood flow
D. ventricular contraction
Answer: C
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The early cell divisions of human development differ from other mitotic cell divisions in that:
A. cells do not replicate all chromosomes prior to dividing; this helps the cells differentiate. B. cells do not grow in size; they subdivide the cytoplasm of the fertilized egg. C. cells move as they divide. D. they are unequal; some daughter cells are much larger than others. E. All of these choices are correct.
In human oogenesis, how many chromosomes does an oogonium carry?
A) 22 B) 23 C) 44 D) 46 E) 92
Which of the following mass extinctions is correctly matched with the date of the extinction?
A. Triassic-251 mya B. Cretaceous-65.5 mya C. Silurian-445.2 mya D. Devonian-443.7 mya
Propose an argument for why the urinary system is much more than just a waste filtration site and is also a major player in the game of homeostasis
What will be an ideal response?