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True or false: Throughout the menstrual cycle, estrogen only exhibits negative feedback on the hypothalamus. 

 Okay, you had to know it was coming (see the ominous foreshadowing above in question 54). In the movie The Rock (a.k.a. the best movie ever), terrorists are using VX, a lethal nerve gas. VX effects can be inhibited by atropine by blocking acetylcholine receptors. Hooray! Nicholas Cage is saved (an Oscar-worthy performance for sure). However, the terrorist that is exposed to VX without atropine dies a horrible (gurgling?) death. Why? 

Which external signal is required for progression through the cell cycle?

 How many ATP are produced and consumed during glycolysis? 

What determines the transport maximum for glucose in the kidney?

ATP is required for muscle relaxation as well as for contraction. What are the two events requiring ATP for relaxation?

In skeletal muscle, what initial event is required to allow myosin crossbridges to bind to actin? 

The affinity for O2 binding with hemoglobin can be affected by a number of factors even when the same PO2 exists. Which of the following scenarios is false?

Which of the following originates in the hypothalamus but is secreted in the posterior pituitary?

Central chemoreceptors are neurons in the medulla (which is in the brain and thus protected by the blood-brain barrier) that respond directly to changes in ________.