Category: General

Why tightness in chest?

Score: 4.4/5 (68 votes) Chest tightness is common and can be attributed to several different causes, including infection, pulmonary (lung) conditions, ga...

Is mouth derived from endoderm?

Score: 4.9/5 (55 votes) First, in all animals, the mouth is derived from ectoderm and endoderm. Indeed, in deuterostomes a specific region, the EAD, devo...