1. H

    Relationship between arterial oxygen saturation and heart rate

    hey guys, i'm looking for the explanation of relationship between arterial oxygen saturation and heart rate, i've been searching on google but got stuck in the situation where i have to pay an account for reading journal with the same topic. could anyone explain to me please? thank you.
  2. HereWeGo21

    Acetylcholine and heartrate

    So I got a Kaplan question saying that Ach administration INCREASES heart rate? I now get the mechanism they're going for. Ach --> peripheral vasodilation --> reflex tachycardia. But...like...what about the M2 muscarinic receptor on the heart?? Wouldn't Ach directly cause bradycardia by acting...