Answer:With this system, blood always flows in only one direction inside the heart. There are also valves at the bottom of the large arteries that carry blood away from the heart: the aorta and the pulmonary artery. These valves keep the blood from flowing backward into the heart once it has been pumped out.
Explanation:
Answer:
<h2>Demographic measures are the actual changes in size, composition and distribution due to changes in demographic components like birth, death and migration, as a result of their respective processes like rate of fertility, mortality and migration.</h2>
<span>A heart attack happens when one or more of your coronary arteries become blocked.</span>
Avoid would be the best answer for this
Explanation:The first step is to maintain a good diet and to eat what is necessary for the body.If you have any enquiries please consult a dietitian.And don't forget to exercise daily or just walk for one or half an hour.For adults constantly try checking the:- blood pressure,sugar,cholesterol,etc
