We maintain a fairly constant body temperature despite exposures to different seasons or external temperatures. This is achieved through our capacity to
A. adapt to changing environments.
B. regulate body temperature.
C. maintain homeostasis.
D. All of these choices are correct.
E. None of these choices are correct.
Answer: D
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What functions do proteins perform?
a. as catalysts in chemical reactions b. in gene regulation c. in structural and mechanical support d. all of the above
Which statement is not true?
1.Erythrocytes are involved in the defense response. 2.Erythrocytes are the most abundant in the human body. 3.Erythrocytes are different than the neutrophils, lymphocytes, eosinophils, and monocytes. 4.Hemoglobin contains the element iron.
Leptin is a circulating hormone that is produced by fat cells and plays a role in body metabolism and obesity. It normally binds to receptors in the brain and inhibits appetite. Studies have demonstrated that when obese mice that are leptin deficient are injected with leptin they quickly lose their excess weight. Interestingly, however, many overweight people have high levels of leptin in their bloodstream. Why do you think that the high levels of leptin in obese individuals are insufficient to curb their appetite?
A. In obese people with high levels of leptin, the leptin is a non-functional second messenger. B. The form of leptin released by obese people may lack protein kinase activity. C. Obese people who have high levels of leptin may have a leptin receptor with decreased sensitivity. D. Paracrine signaling may be disrupted in obese people with high levels of leptin.
Which of the following is most likely to be responsible if, when your blood sugar level rose, the level went back down?
A) the use of the sugar for energy by your cells B) a homeostatic mechanism based on negative feedback C) type 2 diabetes D) a homeostatic mechanism based on positive feedback