Blood clotting is considered to be an example of a positive feedback situation. Explain why this is so, and demonstrate the appropriate steps or areas of hemostasis as part of your explanation.
What will be an ideal response?
In the blood clotting process, each step triggers a new step(s), by activating enzymes or putting components together that were previously separated. Some of the products formed "feed back" to enhance earlier reactions, sustaining the cascade until some components are completely consumed. See Figure 16.9 in the chapter.
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Heat-releasing mechanisms include which of the following?
A) vasodilation and sweating B) sweating C) vasodilation D) vasoconstriction and sweating E) vasoconstriction
Which part of the embryo contributes to the fetal portion of the placenta?
A) trophoblast B) epiblast C) inner cell mass D) hypoblast
During implantation, the
A) trophoblast erodes a path through the endometrium. B) inner cell mass begins to form the placenta. C) maternal blood vessels in the endometrium are walled off from the blastocyst. D) entire trophoblast becomes syncytial. E) inner cell mass is temporarily deprived of nutrients.
What type of vessel consists of one layer of endothelial cells?
A. Arterioles B. Capillaries C. Veins D. Arteries