A heart attack happens when blood flow to the heart suddenly. becomes blocked and the heart canât get oxygen. quickly, the heart muscle fails to pump and begins to die. disease (CHD), also called coronary artery disease.
The B-cell receptor is composed of two parts: i) A membrane-bound immunoglobulin molecule of one isotype (IgD, IgM, IgA or IgE).he B-cell receptor is composed of two parts: i) A membrane-bound immunoglobulin molecule of one isotype (IgD, IgM, IgA or IgE).
chemoreceptor (kÄÂ´mÅrÄsepÂ´tÉr) , n a specialized sensory end organ adapted for excitation by chemical substances (e.g., olfactory and gustatory receptors) or specialized sense organs of the carotid body that are sensitive to chemical changes in the bloodstream.here are chemoreceptors in the large arteries of the thorax and the neck; called carotid and aortic bodies. These receptors are responsive to changes in the oxygen, carbon dioxide and hydrogen ion concentration in the blood.