Enzymes and Hormones in the Process of Chemical Digestion

This report provides an overview of chemical digestion, a crucial process where large food molecules are broken down into smaller, absorbable nutrients with the help of enzymes and hormones. The process begins in the mouth and continues in the stomach and small intestine, involving various enzymes like pancreatic amylase for carbohydrate digestion, pepsin and peptidases for protein digestion, and lipases for lipid digestion. Nucleic acid digestion relies on nucleosidases and phosphatases. Hormones such as ghrelin, gastrin, secretin, cholecystokinin, and glucagon-like peptide 1 play significant roles in regulating appetite, gastric juice production, bile production, and intestinal activity. The report concludes by emphasizing the importance of both mechanical and chemical digestion in nutrient absorption and overall health. Desklib offers additional resources and solved assignments for students seeking a deeper understanding of these complex biological processes.

CHEMICAL
DIGESTION
Introduction
Human body utilizes two different types of
digestion: one is chemical digestion and another is
mechanical digestion. Mechanical digestion
processes includes chewing, swallowing and the
muscular movements which help the food through
the digestive tract which is further supported by
chemical digestion by using some enzymes that
helps to breaks the food particles in more smaller
molecules enough so that they can be absorbed
easily (Panawala, 2017).

 Chemical digestion is basically the breakdown of the large molecules or food
into the smaller nutrients so that it can be used by the body cells easily. There are
various enzymes and hormones involved in the chemical digestion of food.

 (Source: Anatomy and physiology, 2018)
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 Chemical digestion is not started in the
stomach but in the mouth. The moment
when the people see, smell or even
think about the food, their mouth begins
to secrete extra saliva. Chemical
digestion is happens in the mouth,
stomach and small intestine.

Role of enzymes
 Digestion basically involves engulfing the
large food portions and breaking them
into the micronutrients that are small
enough to be absorbed by the body cells.
Although chewing and peristaltic
movement help the body to break those
molecules but it is not possible for them to
break particle small enough. This why
body needs chemical agents to act on the
food partials

Types of enzymes involved in
chemical digestion
 Salivary enzyme
 Pancreatic amylase
 Maltase
 Pepsin
 Trypsin
 Peptidases
 Nuclease
 Nucleosidases
 lipases

Enzymes in Carbohydrate
digestion
 Pancreatic amylase: it does heavy lifting
 Alpha-dextrinase: works to break single
unit
 Sucrase : it acts on sucrose
 Maltase: it acts on maltose
 Lactase: it splits lactose

Enzymes in protein
digestion
 Proteins are the amino acids that are
consumed in the diet as the essential
nutrition. The digestion starts in the
stomach where the pepsin and HCL
catabolise the protein into smaller
particles or polypeptide. These molecules
are than reach to small intestine where is
further processed by various enzymes
such as amino peptidase and dipptidase.

Enzymes helpful in lipid digestion
 Lipids are the nutrients that consumed is
calorie and accounts for 35 per cent of
total calories intake. There are three
enzymes that are responsible for lipid
digestion: gastric lipase, lingual lipase
and pancreatic lipase.

Enzymes responsible for Nucleic
acid digestion
 The nucleic acids RNA and DNA are
available in most if the food products
that are consumed by people. the
digestion of these molecules takes place
with the help of two pancreatic enzymes
called nucleosidase and phosphatase.

Hormones role in chemical
digestion
 It has been well understood that
hormones play a key important role in
the control of food intake and digestion.
Gut is the largest produces of hormones
in the body. It releases more than twenty
different peptide hormones that are
helpful in various reaction associated
with digestion.

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 Ghrelin: increases the appetite
 Gastrin: trigger gastric juice production
 Secretin: triggering alkaline production
from pancreas

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 Cholecystokinin: reduce appetite and
stimulate bile production
 Peptide YY: increase the efficacy of
digestion and absorption
 Glucagon Like Peptide 1: it inhibits
gastric emptying and trigger insulin
secretion.