digestive system- video 1

Question 1

digestive processes (6)

Answer 1

1. ingestion
2. propulsion
3. mechanical digestion
4. chemical digestion
5. absorption
6. defecation

Question 2

ingestion

Answer 2

entry of food into alimentary canal through mouth

Question 3

propulsion

Answer 3

• movement of food through digestive tract
• includes both voluntary swallowing and involuntary peristalsis

Question 4

peristalsis

Answer 4

• sequential, alternating waves of contraction and relaxation of alimentary wall smooth muscles which act to propel food along
• mix food with digestive juices

Question 5

two types of digestion

Answer 5

• mechanical digestion’s pure physical process does not change chemical nature of food.
• includes chewing, tongue movements, mechanical churning (stomach), segmentation (small intestine): localized contractions of muscles that isolate small sections moving contents back and forth
• chemical digestion involves secretions that break down food molecules into their chemical building blocks. extracellular digesetion

Question 6

mucosa

Answer 6

• inner layer of digestive tract
• produces mucus that lubricates the whole system
• secretes digestive enzymes for chemical digestion

Question 7

muscalaris layer

Answer 7

• middle layer of digestive tract
• longitudinal muscles shorten or lengthen the tract
• facilitate mechanical digestion and propulsion that occurs in alimentary canal

Question 8

absorption

Answer 8

movement of nutrients into the blood stream - primarily takes place in small intestine