What biological effect is present when an animal shows a

person affection in a comfortable setting?

increase in the hormone cortisol

decrease in the neurotransmitter serotonin

decreased heart rate

increased blood pressure

decreased heart rate

Explanation:

In a setting where the person is comfortable and the animal with him shows affection towards him, the person shows positive effects in themselves. The heart rate of the person slows down to a relaxed state. The production of fewer stress hormones decreases. There emerges a growth in the brain chemicals which makes the person happier. This is the result of the emotional bonds which the individuals experience when they are with the animals.