biology

1. Describe the three sources of ATP production and the four roles of ATP for skeletal muscle contraction. 4 pts

2. Compare and contrast transmission of electrical activity at a neuromuscular junction with that at a neuronal synaptic junction. 4 pts

3. What are the two general mechanisms by which first messengers elicit an increase in cytosolic Ca2+ concentration? What are the sources of the Ca2+ in each mechanism? 4 pts

4. Compare and contrast three classes of hormones, including synthesis, transport, action mechanism, regulation of secretion, and metabolism. 4 pts

5. Describe action potentials of a typical ventricular myocardial cell (a non-pacemaker cardiac muscle cell) and a sinoatrial node cell (an autorhythmic pacemaker cardiac cell), including the names of ionic channels and ionic movements. 4 pts