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Birthrate Just answered it got it right
AMBU bag must deliver between 700 and 1000 milliliters of air to the victim's lungs, but if oxygen is provided through the tubing and if the victim's chest rises with each inhalation (indicating that adequate amounts of air are reaching the lungs), 400 to 600 ml may still be adequate. Squeezing the bag once every 5 seconds for an adult or once every 3 seconds for an infant or child provides an adequate respiratory rate (12 respirations per minute in an adult and 20 per minute in a child or infant).
The depth of penetration is greater than the recommended 2.0mm for heel incision devices. Run the risk of nerve damage. In addition, 2.8mm lancet will not produce enough blood for the PKU, etc. testing requirements, Lastly, a puncture wound is typically of "lower quality sample" due to the puncture vs incision wound type.
If you mean "why do some men have a male foot fetish" then this is a good question, and a surprisingly common phenomenon in straight men! I am a gay guy, and have a foot fetish myself, so I have come across lots of straight men who have massive fetishes for male feet despite being into women! I am no psycologist, but (according to experts) most foot fetishes are said to stem from the experiences/discoveries of an infant, which (when pleasurable or non threatening/comforting) forms a subconcious bond or connection to a specific object/or thing. If you think about it, a fetish starts in much the same way as a phobia which is just as irrational, but associated with fear/discomfort instead of pleasure/comfort. A lot of people will forget the trigger/occasion that began a fetish or phobia during infancy, but the brain will still be "wired up" to respond to the certain object with feelings of love and infatuation, or fear. The foot fetish may come from curiosity of the infants own feet, or another present male (his father, grandad, older brother etc) way before sexuality even really matters to a boy, or indeed, way before an infant boy even comes to realise what sex he is conciously. For this reason I believe that as a boy grows up, the infatuation with feet remains something which, in his mind, is an exception to the stigma's of gender or sexuality depending on how the initial experience played out during that early stage of infancy. This was just my theory, but I hope this kinda helps