Complete the following:
1. Which of the substances in the mixture you prepared passed through the filter paper into the filtrate?
2. What evidence do you have for your answer to question 1? _
3. What force was responsible for the movement of substances through the filter paper?
4. What substances did not pass through the filter paper?
5. What factor prevented these substances from passing through?
6. Briefly define filtration.
Critical Thinking Application
Indicate which of the following involves filtration by answering yes or no.
1. Oxygen molecules move into a cell and carbon dioxide molecules leave a cell because of differences in the concentrations of these substances on either side of the cell membrane._
2. Blood pressure forces water molecules from the blood outward through the thin wall of a blood capillary._
3. Urine is forced from the urinary bladder through the tubular urethra by muscular contractions._
4. Air molecules enter the lungs through the airways when air pressure is greater outside these organs than inside._
5. Coffee is made using a coffee maker (not instant)._
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.