Wha produce digestive juice that breaks down food

Astructural difference between the trachea and esophagus that prevents the trachea from collapsing is the presence of: a) smooth muscle b) skeletal muscle c) respiratory cilia d) rings of cartilage

What system have glands found throughout the body that release hormones into the bloodstream

Choose thyroid, parathyroid, or the adrenal gland and choose one disease affecting this part of the en-docrine system.