How our heart work?
Please use your text, study materials, and/or a good search engine or two to find your answers.
1. Go to http://www.google.com or http://www.bing.com
2. Type in how the heart works (or whatever search terms you need). Press Enter.
3. Read different search results until you find what you need.
4. Re-search with different search terms if you don't find all you need.