Question

Berk says your mind, hormone system and immune system are constantly communicating with one another in ways that impact everything from your mood to your ability to fend off sickness and disease. Take grief: "Grief induces stress hormones, which suppress your immune function, which can lead to sickness," he says.

–"You Asked: Does Laughing Have
Real Health Benefits?,"
Markham Heid

Which topic sentence best introduces the supporting evidence in this passage?

Laughter is the brain’s way of getting rid of stress caused by a weak immune system.
Grief can be very painful and is often hard for people to overcome, so they laugh often.
The hormone system is very important and functions only if people are happy.
The systems in our bodies communicate with one another, which affects health and healing

Answer 1

"The systems in our bodies communicate with one another, which affects health and healing."

Explanation: The passage describes how the mind, hormone system, and immune system interact and how those interactions (e.g., grief raising stress hormones that suppress immunity) affect health, so this sentence best introduces that evidence.