Which of the following is not one of the effects of epinephrine? Increase in blood pressure Increase in blood glucose concentration Increased water retention Increase in heart rate

To determine which of the options is not an effect of epinephrine, let's analyze each one: 1. **Increase in blood pressure**: Epinephrine causes vasoconstriction in some blood vessels, which can lead to an increase in blood pressure. 2. **Increase in blood glucose concentration**: Epinephrine stimulates glycogenolysis and gluconeogenesis in the liver, leading to an increase in blood glucose levels. 3. **Increased water retention**: Epinephrine does not primarily cause increased water retention. This effect is more associated with hormones like aldosterone or antidiuretic hormone (ADH). 4. **Increase in heart rate**: Epinephrine increases heart rate by stimulating beta-adrenergic receptors in the heart. Based on this analysis, the option that is **not** an effect of epinephrine is: **Increased water retention**.