Answer:
"Through inhabiting the role of medical students in a hospital, students are able to draw the connections between the
large-scale, macro-level experiences of the body and the micro-level processes that make the body function as they
first diagnose a patient and then analyze the metabolism of world-class athletes. I uncovered how body systems work
together to bring molecules from food and air to the trillions of cells in the human body.
Elisa feels tired because her cells aren’t getting the molecules they need from food and air, which
are necessary for her cells to function, grow, and repair. Elisa’s cells are getting enough oxygen and amino acids, but not enough glucose. Her digestive
system should break down starch molecules into glucose molecules, which are small enough to get into cells, and her
circulatory system should deliver the glucose to cells. Elisa feels tired because her cells need both glucose and oxygen to release energy, in a process
called cellular respiration." -www.hcms297.org
Hope This Helps! :D