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).
Membrane Receptors. Membrane receptor is a protein molecule that are specific to the cell membrane, (hormones, neurotransmitters, drugs) external molecules them, causing a change in cell function, was added. This process is called transduction: external signal, is introduced into the action.