Select the action(s) that can result from nicotine absorption.

The option indicating "All of the above" is correct because nicotine absorption can lead to a range of physiological and psychological effects on the body.

Nicotine is a stimulant that interacts with the brain's neurotransmitters, leading to various outcomes. Improved concentration is one of the effects because nicotine can enhance alertness and cognitive performance due to increased dopamine levels, which can temporarily boost focus and attention.

Additionally, nicotine has a stimulating effect on the cardiovascular system, often causing tachycardia, or an increase in heart rate. This occurs because nicotine stimulates the release of adrenaline, which can lead to heightened heart activity and increased blood pressure.

Contrary to typical expectations, nicotine is sometimes associated with decreased appetite or reduced hunger in the short term, but it can also lead to increased cravings for food in long-term users or during withdrawal phases. This variability shows that individual responses to nicotine can differ significantly.

Overall, the correct choice encompasses the range of effects that can result from nicotine absorption, indicating its complex role in influencing bodily functions.