This document discusses the two types of digestion: mechanical and chemical. Mechanical digestion is the physical breakdown of food using mechanical forces, like chewing. Chemical digestion is the breakdown of food into nutrients at a molecular level using digestive enzymes. The document then describes where each type of digestion occurs within the digestive system, including mechanical digestion in the mouth by chewing and chemical digestion by saliva breaking down carbs. It further explains mechanical and chemical digestion in other parts like the stomach and small intestine.
States of Matter: Solids, Liquids and Gases [Presentation]Greg Good
Presentation for junior high school science.
Topic: States of Matter: Solids, Liquids and Gases.
Comprehensive 33-slide presentation designed for self-directed learning, although equally useful as a classroom presentation.
Neatly laid out with clear and detailed explanations.
Covers:
• Properties of Solids, Liquids and Gases
• Particles in Solids, Liquids and Gases
• Heat Energy and State Changes
• Expansion and Contraction in Solids, Liquids and Gases
There are several digital and print worksheets available that accompany this presentation.
<a />www.GoodScienceWorksheets.com</a>
*Presentation is in Adobe Acrobat format. View in full screen mode (Ctrl L) and scroll through slides with arrows; Esc to get out of full screen view, navigate through slides using Page Thumbnails on left side of page, just like a PowerPoint presentation.
vCell Structure and Function. Cell wall: It helps in protecting the plasma membrane and plays a vital role in supporting and protecting the cells. ... Nuclear membrane: The bilayer membrane, which protects the nucleus by surrounding around it and acts as a barrier between the cell nucleus and other organs of a cell.
States of Matter: Solids, Liquids and Gases [Presentation]Greg Good
Presentation for junior high school science.
Topic: States of Matter: Solids, Liquids and Gases.
Comprehensive 33-slide presentation designed for self-directed learning, although equally useful as a classroom presentation.
Neatly laid out with clear and detailed explanations.
Covers:
• Properties of Solids, Liquids and Gases
• Particles in Solids, Liquids and Gases
• Heat Energy and State Changes
• Expansion and Contraction in Solids, Liquids and Gases
There are several digital and print worksheets available that accompany this presentation.
<a />www.GoodScienceWorksheets.com</a>
*Presentation is in Adobe Acrobat format. View in full screen mode (Ctrl L) and scroll through slides with arrows; Esc to get out of full screen view, navigate through slides using Page Thumbnails on left side of page, just like a PowerPoint presentation.
vCell Structure and Function. Cell wall: It helps in protecting the plasma membrane and plays a vital role in supporting and protecting the cells. ... Nuclear membrane: The bilayer membrane, which protects the nucleus by surrounding around it and acts as a barrier between the cell nucleus and other organs of a cell.
Digestion and absorption, digestive secretions, their characteristic features: Digestion is the breakdown of food into particles small enough to cross the cellular barrier of the gastrointestinal (GI) system and be carried around the body in the circulation.
This occurs by both mechanical and chemical processes that begin in the mouth and generally end in the small intestine, where 90% of absorption takes place.
The other 10% takes place in the stomach and large intestine and often involves the help of the gut microbiota.
A small amount of absorption is also thought to take place in the mouth.
Mechanical digestion begins in the mouth with chewing and continues with segmental muscle contractions in the stomach and intestines.
Chemical digestion is primarily mediated by enzymes present in the secretions of the salivary glands, stomach and pancreas, and on the epithelial lining of the small intestine
Mechanical digestion is physical process in which food is broken into smaller pieces without chemically.
It begins with our first bite of food and continues as we chew food with our teeth into smaller pieces.
The process of mechanical digestion continues in the stomach. This muscular organ churns and mixes the food it contains, an action that breaks any solid food into still smaller pieces.
Chemical digestion is the biochemical process in which macromolecules in food are changed into smaller molecules that can be absorbed into body fluids and transported to cells throughout the body.
Substances in food that must be chemically digested include carbohydrates, proteins, lipids, and nucleic acids.
Carbohydrates must be broken down into simple sugars, proteins into amino acids, lipids into fatty acids and glycerol, and nucleic acids into nitrogen bases and sugars.
Some chemical digestion takes place in the mouth and stomach, but most of it occurs in the first part of the small intestine (duodenum).
Chemical digestion could not occur without the help of many different digestive enzymes. Enzymes are proteins that catalyze or speed up biochemical reactions.
Digestive enzymes are secreted by exocrine glands or by the mucosal layer of the epithelium lining the gastrointestinal tract.
In the mouth, digestive enzymes are secreted by salivary glands.
The lining of the stomach secretes enzymes, as does the lining of the small intestine.
Many more digestive enzymes are secreted by exocrine cells in the pancreas and carried by ducts to the small intestine
About 80 percent of digestible carbohydrates in a typical Western diet are in the form of the plant polysaccharide amylose, which consists mainly of long chains of glucose and is one of two major components of starch.
Additional dietary carbohydrates include the animal polysaccharide glycogen, along with some sugars, which are mainly disaccharides.
To chemically digest amylose and glycogen, the enzyme amylase is required. The chemical digestion of these polysaccharides begins in the mou
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2. OBJECTIVE OF THE LESSON
1.Define digestion.
2. differentiate Mechanical
and Chemical digestion
3. TERMS TO KNOW:
1.DIGESTION- is the
process where food is
broken down by the
digestive system into
small nutrients to be
absorbed by the body.
4. TERMS TO KNOW:
2. NUTRIENTS- are very
tiny molecules that are
broken down from large
molecules to be
absorbed and used by
body cells.
5. Types of Nutrients
• Micronutrients- vitamins, minerals, & water
• Macronutrients- proteins, lipids, carbohydrates,
etc…
6. TWO TYPES OF DIGESTION
1.MECHANICAL DIGESTION- is the
process of changing physical form
of food.
2. CHEMICAL DIGESTION-is the
process of changing chemical
composition of food into a new
substances with the aid of
digestive enzymes.
7.
8.
9. Mechanical and Chemical Digestion in
the Parts of Digestive System
Mouth- takes place inside
the mouth mechanical
digestion where teeth and
tongue breakdown food by
chewing, tearing, grinding,
mashing, mixing and
crushing
10. Mechanical and Chemical Digestion in
the Parts of Digestive System
Mouth- the salivary
gland secrete mucus and
an enzyme called
amylase to breakdown
carbohydrates to simple
sugar, it is chemical
digestion.
11. Mechanical and Chemical Digestion in
the Parts of Digestive System
• Esophagus
The esophagus is a muscular
tube. As we swallow, we push
food along the tube until the
food reaches our stomach.
This process of pushing down
the food is called peristalsis
12. Mechanical and Chemical Digestion in
the Parts of Digestive System
Peristalsis: A type
of physical
(mechanical) digestion
in which food is
squeezed through
your digestive tract;
like from your
esophagus into your
stomach
13. Mechanical and Chemical Digestion in
the Parts of Digestive System
• Stomach
• The stomach mixes
the Food with
gastric juices called
pepsin to form
chyme. The
chemical digestion
of proteins begins
in the stomach.
14. Mechanical and Chemical Digestion in
the Parts of Digestive System
• Small Intestines
• Where fat molecules are
broken down into smaller
molecules. Which is an
example of chemical
digestion.
• The remaining food is pushed
down (peristalsis) to exit the
digestive system. Which is an
example of physical digestion.
15. Mechanical and Chemical Digestion in
the Parts of Digestive System
• Large Intestine
• Where excess water
is removed before
eliminating waste.
Which is an example
of physical digestion.
16. What type of digestion it is?
1.Chewing a Fish ball?
2.Saliva breaking the carbohydrates down
into molecules of glucose?
3.Fat molecules broken down into smaller
molecules in the small intestine?
4.Your tongue breaking pieces of a hamburger
apart?
5.Excess water being removed by the large
intestine?
6.Pepsin (an enzyme) in your stomach
breaking the hamburger into amino acids?
7.Peristalsis occurring in the esophagus?