histamine receptor

action adipose allergies allergy alveoli anaphylactic anaphylaxis anatomy and antibody antigen asthma brain bronchi capillary care cell cells central chemistry degranulation diagram disease effect fat function gastrointestinal health heart histamine human ige illustration immune immunology intestine large lungs lymphocyte mast mechanism medical nervous neuron organ organs physiologic physiology pollen reaction receptor receptors shock skin small stomach system target thymus tissue tract white