Explain how your psychology affects your biology in relation to public speaking?

What will be an ideal response?

Your view of the speaking assignment, your perception of your speaking skill, and your self-esteem all interact to create anxiety. You want to do well, but you're not sure that you can or will. Presented with this conflict, your brain signals your body to switch to its default fight-or-flight mode: You can either fight to respond to the challenge or flee to avoid the cause of the anxiety. Your body responds by summoning more energy to respond to the challenge. Your breathing rate increases, you pump more adrenaline, and you rush more blood through your veins. To put it more technically, you are experiencing physiological changes because of your psychological state, which explains why you may have a more rapid heartbeat, shaking knees and hands, a quivering voice, and increased perspiration.