Refer to Figure 36-1. During the development of secondary vascular tissues, which of the following
structures does not become incorporated into the periderm?
a. 1
b. 2
c. 3
d. 4
e. 5
E
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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. sympathetic activation of smooth muscle in large veins B. skeletal muscle activity compressing veins and forcing blood flow C. one way flow in the venous system due to valves D. ventricular contraction E. None of the choices for this question are correct.
How do humans use red algae polysaccharides?
A. Thickeners B. Herbicides C. Adhesives D. Detergents
If an overheated person perspires, this is an example of a ________ mechanism
a. heat stroke b. positive stimulus c. negative feedback d. positive feedback
What is a transgenic organism?
a. an organism with multiple copies of the same gene b. an organism that has genes from another species c. an organism that does not use DNA to specify proteins d. an organism that has had its entire genome sequenced e. an organism that has been DNA profiled