Describe how endocrine and exocrine glands differ structurally
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Endocrine glands lack ducts and secrete their products, usually hormones, directly into the blood. Exocrine glands possess ducts lined with epithelial cells. Products are released through these ducts to the exterior of the body or into a hollow organ that opens to the outside of the body.
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You are observing the rate of an enzymatic reaction. You continue to add substrate in higher and higher concentrations, but eventually you see the rate of reaction plateau, no further increases in the rate of the reaction could be observed. Which of the following are plausible explanations for your observation (select all that apply)?A) The enzyme has become saturated.B) The substrate solution has become contaminated with an allosteric inhibitor.C) The enzyme molecules are being used up and broken down by the reaction.D) Over time, the substrate molecules are denaturing.E) The temperature of the room needs to increase to increase the rate of reaction.
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Describe the difference between spatial and temporal summation in a postsynaptic neuron
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Class II MHC proteins would be found on all of the following except:
A. dendritic cells. B. macrophages. C. B cells. D. neutrophils.
The atrioventricular valves permit blood flow
A) in one direction only. B) in both directions. C) in many directions. D) in opposite directions on the right and left. E) None of the answers is correct.