BIOSC 1250 Lecture Notes - Lecture 21: External Anal Sphincter, Internal Anal Sphincter, Cheeseburger
Document Summary
For a moment, let"s go back to consider beakerman a cell sitting in the corner of a beaker (slide 1). We have been adding systems to the beaker to allow the needs of this cell to be met. We have added in a circulation to move things around. We have added a filtering system to keep the fluid circulating clean and of the appropriate ionic composition (i. e. , the kidneys). We"ve added in a respiratory system to exchange gasses with the outside environment. Now we will add in a system to provide a source of energy substrates and chemical building blocks - glucose, proteins, fats, vitamins, etc. In the case of gasses, we made a pocket with a large surface area for the exchange of gasses between body and outside world by diffusion across a large surface area (the alveoli in the lungs).
