Which organ system removes nitrogen-containing waste products from blood?
A) lymphatic system
B) integumentary system
C) muscular system
D) urinary system
Answer: D
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In step 6 of the citric acid cycle, succinate + FAD fumarate + FADH2. Which statement concerning this reaction is true?
A. Fumarate is more oxidized than succinate. B. FAD is more reduced than FADH2. C. FAD is an oxidizing agent in the reaction. D. This is not an oxidation/reduction reaction, that is, no electrons have moved. E. a and c are both correct.
Toll-like receptors (TLRs) bind molecules on pathogens. Why is this helpful to the immune response?
A. It provides a highly specific response to very small and highly unique areas on an individual pathogenic microbe, providing the most specific and selective response possible. B. It provides a general response to broad categories of molecules/cells that should NOT be in our system, as we don't have these molecules on our own cells. C. These secreted molecules help bind pathogens and then direct them to receptors on the immune system cells that are best capable of eliminating them from our systems. TLRs are delivery mechanisms for the immune responses. D. TLRs are capable of directly lysing (destroying) the microbes, helping our immune responses by eliminating pathogens.
Eustress is defined as a level of stress that results in improved performance.
a. true b. false
The human body temperature is relatively constant. Which is a feedback mechanism that helps the human body maintain its normal temperature in a cold environment?
A. Water is released from the skin. B. Muscles shake in small movements. C. The rate of heart beats slows. D. The lungs take in additional air.