<span>The coronary sinus is the venous structure that does not empty blood into the right atrium. The coronary sinus is a collection of veins joined together to form a large vessel that collects blood from the heart muscle (myocardium). </span><span>It receives blood mainly from the small, middle, great and oblique cardiac <span>veins</span></span>. It also receives blood from the left marginal vein and the left posterior ventricular vein.
Viruses are pieces of genetic material encased in a coat of protein
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Answer:
R group
Explanation:
All amino acids have both an amino group and a carboxyl group. The R-group (sometimes called the variable group) is what differentiates amino acids from one another. These R-groups have various structural properties that dictate the function of the resulting amino acid chain.
