Conscious Awareness of Body Function, Glucagon & Presynaptic Neuron - Physiology Assignment Help

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Introductions       
 

1. Where in a target cell is a peptide hormone most likely to bind in order to exert its effects- on a membrane receptor or on a cytosolic receptor?

2. Conscious awareness of body function occurs in which brain region? 

3. Does the binding of insulin to receptors on skeletal muscle result in exactly the same cellular responses as the binding of insulin to receptors on liver cells? Explain your answer. 

4. What stimulates the release of glucagon from pancreatic alpha cells?

5. Consider the sequence of events that results in neurotransmitter release at a chemical synapse. Following the arrival of the action potential at the axon terminal of the presynaptic neuron, what is the next step that occurs?

6. Excess glucose is stored in cells as glycogen or converted to lipids. When plasma glucose is high, are cells more likely to build storage molecules or break them down? Which hormone promotes the storage of glucose in cells?

7. If the response of a homeostatic feedback loop in the body is to decrease blood pressure, what would the original stimulus have been?

8. In rod cells of the eye, the rhodopsin molecule has two components- retinal and opsin- which component is activated by light photons?

9. What effect does parasympathetic nervous system activation have on heart rate?

10. Which neurons release neurotransmitters into the interstitial fluid around target cells via swellings at the ends of postganglionic axons known as varicosities?

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