Pacemakers maintain the heartbeat in people who suffer from certain defects. the function of an artificial pacemaker is to send electrical impulses that will contract the heart muscles and regulate the pumping of the heart. which condition could be corrected by a pacemaker?

Artificial pacemakers treat irregular heart rates and rhythms. Several conditions may be treated by an artificial pacemaker, such as bradyarrhythmias (slow heart rhythms), syncope (fainting spells), congestive heart failure (the heart pumps insufficiently which results to failure in maintaining blood flow), and hypertrophic cardiomyopathy (the heart becomes thick without a cause which results to failure in pumping blood effectively).

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.

not only is it colder, it also becomes darker, less salty, and more dense.