1. Before giving a speech to the class, Johnny becomes very nervous: His eyes dilate, glands release sweat, and his blood vessels become wider. How will this affect Johnny s blood flow before his speech
a. The larger blood vessels will decrease the vessel diameter and increase blood flow throughout his body
a. His nervousness will have no effect on his blood flow
a. There will be too much blood so his blood will flow slowly.
a. His blood will become too viscous to flow through, causing Johnny to faint before his speech.