When you fill out a check for certain amount of money and then sign that check, you are saying you might have money in that account?

when you fill out a check then sign it that means that there is positive that amount in your balance and that you are willing to pay it for whatever the case may be

accelerated heartbeat, raise in blood pressure, slow in digestion, raise in blood sugar and perspiration. (myers' psychology for ap 2nd edition pg 87)