what is role of saliva in our mouth
Saliva Saliva is a watery substance formed in the mouths of animals, secreted by the salivary glands
Swallowing 5) Closure of the nasopharynx
Small intestine Food from the stomach is allowed into the duodenum through the pylorus by a muscle called the pyloric sphincter.
Blood Blood is a body fluid in humans and other animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells.[1]