What organ in the digestive system contains hydrocloric acid?

How long until MRI scan results come back? What environmental factors contributed to the spread of smallpox? What is the role of macrophages in stimulating B lymphocytes? What are the 4 causes of anemia? What does it mean when you wake up with a empty feeling in your stomach? Is chyme released by the stomach into the intestines? Why when you move your arms from side to side do your lungs breathe on their own? What is light brown patch of skin that is slightly raised? What can you do to get your virginia to stop itching? Why does my labia majora ache when im on my period? Why is my period was a week early and very heavy? What does it mean if you vomit a yellow substance first thing in the morning? Can someone be half dyslexic? Nausea dizzy tierd but cant sleep never can get comfy and lots of discharge with pink in it and then period the day after What could that be? What antigen is found on the surface of a erythrocyte? What is a latent response? Why have lungs replace with skin for gaseous exchange in higher organisms? What is the suture found between the two parietal bones? Is the subcutaneous layer attached to the dermis by basement membranes? What muscle is responsible for unlocking the extended knee in preparation for flexion?