Question

QUESTION 4 What can destroy tooth enamel? a. antibiotics b.extrapolymeric substance c. flagella d. acid QUESTION 5 Which of the following conditions describes what happens when trophozoites emerge from ingestdd cysts and penetrate the intestinal mucosa to cause colitis? a. Amebic dysentery b. Cholera c. Norovirus Acute gastroenteritis d. Hepatitis A Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All Ans atv 4 29

Answer 1

Question 4

Tooth enamel is a very hard and is made of inorganic materials.The main components are calcium and phosphate ions.Enamel covers the entire teeth.95 % to 98% a of enamel is carbonated calcium and phosphate ions that make up hydroxypaite crystals.It also contain 1% to 2% of organic materials like proteins called enamelins .Enamel is formed from epithelial cells called ameloblasts.Tooth enamel is hardest structure in the body.When tooth enamel is overexposed to acids ,it can destroy and cause erosion in tooth enamel.When we consume foods and beverages like soft drinks,fruit drinks that contain high levels of acids dissolves and destroy the tooth enamel.Repeated acid attack can cause the lose of minerals from enamel.This can cause cavities in teeth.Tooth erosion can cause yellow discoloration to teeth,Pain or sensitivity while consuming hot or cold drinks etc.

Question 5

The correct answer is amoebic dysentry.Amoebic dysentery or Amoebiasis is an intestinal illness caused by the protozoan parasite Entamoeba histolytica.It is transmitted through contaminated food and water.The symptoms are cramping,diarrhoea,fever etc.The lifecycle of this pathogen includes infective cyst stage and trophozoite stage.The infective cyst enters the body through consumption of contaminated food and water.The cyst is resistant to gastric environment and passes through the stomach to the intestine.When it reaches caecum ,trophozoite emerge from the infected cyst.Then they migrate to the large intestine.Trophozoite is the feeding form of protozoan.Trophozoite is responsible for the infection.Trophozoite invade the intestinal mucosa and cause inflammation.