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Unit 19: Biology Part 2 Page 56 of 137
pressure is the best way to avoid a
stroke, although not smoking is
also helpful.
Conclusion
The cardiovascular system is
crucial for survival. Blood pumped
around the body provides organs
with oxygen, and helps control
Figure 35 – A buildup of plaque body temperature. Pulmonary
from atherosclerosis makes it circulation takes blood to the lungs
harder for blood to get through to get oxygen, and systemic
the artery. circulation takes this oxygen-rich
blood to the various organs of the
If coronary heart disease body. We can keep our
completely blocks the heart’s blood cardiovascular systems healthy by
supply, the result is a heart eating right, exercising, and not
attack. Coronary heart disease is smoking.
the most common cause of death
amongst adults in the United
States. Ways to prevent to
prevent coronary heart disease are Lesson 4:
very similar to ways to prevent
hypertension. Healthy eating and Respiratory and
regularly exercising are very Excretory Systems
important. The best way to
prevent heart disease is by not
smoking. Introduction to the
Respiratory System
Stroke
Take a deep breath in, and slowly
A stroke is caused by let it out. As you do, think about
atherosclerosis of the arteries that the breaths you take without
provide blood to the brain. thinking about it. The truth is, you
Sometimes the blockage of the probably only think about
artery is caused by blood clot, a breathing when you are coughing
free-floating object, or a bleeding and having a hard time breathing.
blood vessel. Reducing blood Even though breathing is not
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