Question

question 19
which step of deglutition is under voluntary control?
oral stage
pharyngeal stage
esophageal stage
gastric phase
question 20
the substances absorbed into the lymph capillaries are:
glycerol and fatty acids.
glucose and glycerol.
amino acids and fatty acids.
glucose and amino acids.

Explanation:

Question 19

Deglutition (swallowing) has three stages: oral, pharyngeal, and esophageal. The oral stage involves voluntary actions like chewing and moving the bolus to the back of the mouth. Pharyngeal and esophageal stages are involuntary (reflexes). The gastric phase is part of digestion, not deglutition. So the oral stage is under voluntary control.

Lymph capillaries (lacteals in intestines) absorb fats. Fat digestion produces glycerol and fatty acids, which are absorbed into lymph capillaries. Glucose and amino acids are absorbed into blood capillaries. So the substances absorbed into lymph capillaries are glycerol and fatty acids.

Answer:

Oral stage

Question 20