<span>Oxygen moving from the bloodstream into a cell down a concentration gradient is a form of passive transport. This is because it is moving from a level of high concentration to an area of low concentration and because there is little energy being used which means passive.</span>
Aerobic exercises is something known as running exercises that requires pumping of oxygenated blood by the heart to deliver oxygen to working muscles, the reason for this is that aerobic exercises are often longer lasting and are for that reason different compared to anaerobic exercises.
Answer:
Some examples of the communicable disease include <u>HIV, hepatitis A, B and C, measles, salmonella, measles, and blood-borne illnesses</u>. Most common forms of spread include fecal-oral, food, se.xual intercourse, insect bites, contact with contaminated fomites, droplets, or skin contact.
