Question

explore it! part 2
position a: food enters the mouth. it is broken down by chewing and grinding. saliva is also secreted from under the tongue to help break down the food with enzymes.

1. is this a mechanical digestion? chemical digestion? both?

position b: once the food has been broken down, it moves down the esophagus using gravity and smooth muscle tissue. it ends up trapped inside the stomach by a sphincter muscle.

1. is this a mechanical digestion? chemical digestion? both?

position c: the stomach then breaks the food down into a liquid form with gastric juices (acid) and churning and grinding motions.

1. is this a mechanical digestion? chemical digestion? both?

Explanation:

Step1: Analyze Position A

Chewing and grinding (mechanical). Saliva with enzymes (chemical).

Step2: Analyze Position B

Movement via gravity and muscle (mechanical). No chemical breakdown mentioned.

Step3: Analyze Position C

Gastric juices (chemical). Churning and grinding (mechanical).

Answer:

1. Both
2. Mechanical
3. Both