These secretions vary in compositions but typically

 These secretions vary in compositions, but typically contain water, various
enzymes, acids, and salts.

 The process is completed in the small intestine.
Absorption
 Which takes place primarily within the small intestine.
 There, most nutrients are absorbed from the lumen of the alimentary
canal into the bloodstream through the epithelial cells that make up the
mucosa.
 Lipids are absorbed into lacteals and are transported via the lymphatic
vessels to the bloodstream (subclavian veins near the heart.
Defecation
 The final step in digestion, undigested materials are removed from the body
as feces.
DEFINITION OF TERMS
Nutrition
It is the result of the processes whereby the body takes in and uses
food for growth, development, and the maintenance of health.
Nutrients
- Chemical substances found in food that are necessary for
good health.
- To maintain health and functions properly the body must be
provided with nutrients.
Essential Nutrients
- Nutrients found only in food.
- They are divided into six classes: Carbohydrates, fats (lipids),
proteins, vitamins, minerals, water.
- They are also divided into two categories organic and
inorganic .
Nonessential Nutrients
- Nutrients that can be made by the body.
- They may also be absorbed from food.
- These nutrients are still required in order to maintain and
achieve health.
Macronutrients
- They are called energy – providing nutrients (except water).
- It is needed in large quantities (in gram range).
- They normally include water, carbohydrates, fat, and
protein.
Micronutrients
- These nutrients include minerals and vitamins.