The digestive and excretory systems work together to ensure the body has proper levels of molecules like salt (NaCl) in the body. Steven, a biology student
studying these two systems, had a really hard workout after school, then went to
the movies where he consumed an entire large popcorn and soda all by himself.
When he woke up the next morning, he had a dry mouth and felt extremely
thirsty. He also noticed he had not urinated since the morning before. Using your
understanding of the digestive and excretory systems, describe what has been
happening to Steven's body, starting with when he went to the movies and ate
popcorn.