Evidence shows that eating foods rich in polyunsaturated fatty acids improves blood cholesterol<span> levels, which can decrease your risk of heart disease. These fatty acids may also help decrease the risk of type 2 diabetes. </span>
<span>There are many ways our body sends messages in order to help regulate bodily function, like mood, body heat, and so forth. One way our body communicates is through the endocrine system. This sends chemical messengers in the form of molecules like the ones in the picture through our bloodstream to perform specific functions.</span>
The cells in the heart need a constant supply of nutrients / oxygen and to get rid of their waste products ans that why it needs its own special circulatory system.
D. Pathogens can be found in saliva and mucus drops from sneezes