Make sure that you have approval from your hospital or university to do these observations on humans, you use sterile practices that do not endanger your subjects, and that you have made necessary arrangements to guard the participants privacy (including securely discarding blood samples). Next, make sure you have as large a number of participants as possible and that they fairly represent the human species. You should choose a widely accepted technique for determining blood potassium. Finally (and this is not obvious yet in your physiology studies), you must be sure you take the samples at about the same time of day since body chemicals (including potassium) vary from one time to another. Page 4 has some of this information.
Positive feedback: (7)
These muscles are skeletal. You know this because you have conscious control over them (wink, wink!). Pages 9-10 but chapter 12 will have much more information about the three types of muscles.
Exocrine: (12)
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