Which of the following would NOT be an example of negative feedback control in homeostasis?
A. Blood volume and pressure drop due to bleeding. This decreased pressure causes the kidneys to increase water reabsorption to increase blood volume and pressure.
B. Exposure to cold water causes body temperature to drop. Decreased stimulation of heat receptors causes constriction of blood vessels near the skin and better retention of heat.
C. Glucose levels rise following consumption of a big dessert, triggering release of insulin which causes glucose levels to fall.
D. During the birth process, stretch receptors in the uterus stimulate the release of oxytocin from the pituitary gland. This hormone stimulates uterine muscle contraction that increases stimulation of the stretch receptors.
E. Blood levels of glucose fall during sustained exercise, causing the release of glucagon which stimulates the release of glucose into the blood.
D. During the birth process, stretch receptors in the uterus stimulate the release of oxytocin from the pituitary gland. This hormone stimulates uterine muscle contraction that increases stimulation of the stretch receptors.
E. Blood levels of glucose fall during sustained exercise, causing the release of glucagon which stimulates the release of glucose into the blood.
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____ describes the process whereby a phagocyte, in response to cytokines secreted by dendritic (or other) cells, exits a blood vessel and moves into an infected region of tissue
Fill in the blank with the appropriate word.
Climate has been proposed to play a role in the latitudinal diversity gradient. Specifically, some have hypothesized that
A. the warm climate of the tropics promotes high speciation rates. B. the warm climate of the tropics promotes niche diversification. C. relatively few species are able to adapt to the harsher, more variable climates of the high latitudes. D. the harsh, more variable climates of the high latitudes reduce speciation rates. E. none of these
Penicillin is a good example of a hapten.
Answer the following statement true (T) or false (F)
two key observations underlying natural selection are that members of a population vary in their ----- and that all species can produce more offspring than the environment can support
Fill in the blank(s) with the appropriate word(s).