the study of the anatomy, normal functions, and disorders of the heart. The medical field dedicated to diagnosing and treating diseases of the heart and cardiovascular system. See Interventional cardiology, Nuclear cardiology.. APC, or atrial premature complex (or beat) is a beat that arise in the atria of the heart from outside the normal mechanism of heartbeats. It's very common and doesn't portend any bad prognosis. It increase with age, smoking, coffee intake, alcohol intake, and stress, and also with heart and lung disease.
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter. It is commonly used in nanotechnology, the building of extremely small machines. This was last updated in September 2005.
Some students will know nothing, some will be well informed. Most students will probably know that nano means something small, but may not know how small. Tell the students that there are 1 billion (1,000,000,000) nanometers in a meter. Each of them brought in an object. Tell them that the object they brought in is to represent 1 nanometer and you'd like to know where the millionth one is located.