Question

level 1 q1 which of the following is true about the role of the mouth during digestion? a. releases hormones b. bones release calcium c. saliva contains an enzyme called amylase that breaks down food d. intestines take up calcium level 1 q2 what organ does food enter after being chewed and swallowed? a. larynx b. esophagus c. stomach d. small intestine level 1 q3 which is not true about the stomach? a. it can expand to store more food b. contains hydrochloric acid c. a muscle that contracts to mix food d. the enzyme lactase is found in the stomach level 1 q4 the human digestive system is approximately 900 cm long. food is moved through the digestive tract primarily by- a. muscular contractions b. bile produced in the liver c. the enzymes amylase and pepsin d. hydrochloric acid in the stomach

Explanation:

• Q1: The mouth's role in digestion involves saliva. Saliva has amylase (an enzyme) that starts breaking down food (like starches). Hormones are mainly released by endocrine glands (not the mouth). Bones releasing calcium is related to bone metabolism (not mouth digestion). Intestines taking up calcium is part of absorption (not mouth function).
• Q2: After chewing and swallowing, food goes down the esophagus (a muscular tube) to the stomach. The larynx is part of the respiratory system (not the digestive tract for food passage). The small intestine is further along in the digestive process (after the stomach in most cases for initial digestion - though technically food goes from esophagus to stomach first).
• Q3: The stomach can expand (accommodate food), has hydrochloric acid (for digestion and killing pathogens), and has muscular contractions (peristalsis - like a “muscle that contracts to mix food”). Lactase is mainly in the small intestine (for digesting lactose - not in the stomach).
• Q4: Food moves through the digestive tract primarily by muscular contractions (peristalsis). Bile (from the liver) aids in fat digestion (not movement). Enzymes (amylase, pepsin) and hydrochloric acid in the stomach are for chemical digestion (not movement of food along the entire tract).

Answer:

Q1: C. Saliva contains an enzyme called amylase that breaks down food
Q2: B. Esophagus
Q3: D. The enzyme lactase is found in the stomach
Q4: A. Muscular contractions