Human Nutrition Flashcards
What is nutrition ?
The way in which organisms obtain and use its food
Autotrophic means
An organism makes its own food
Heterotrophic means
An organism takes in food from its environment
Herbivores
Animals that feed on plants only
Carnivores
Feed on other animals
Omnivores
Animals that feed on both plants and animals
What are the events in human nutrition
Ingestion, digestion , absorption , and egestion
Why is digestion necessary
To allow small molecules of food to be absorbed through the walls of intestines
What is digestion ?
The breakdown of large food molecules to smaller food molecules
Physical digestion?
The breakdown of o food by mechanical means
Four types of teeth are
Incisors
Canines
Premolars
Molars
What is the dental formula
2(I2/2 C1/1 P2/2 M3/3) TOTALIS 32
What is chemical digestion?
The breakdown of food using enzymes
Where is amylase found
In saliva produced by salivary glands
pH of the mouth
7-8
What is peristalsis?
A wave of muscular movement that’s pushes food through the alimentary canal
How does physical digestion in the stomach occur?
The churning of food
What is chyme?
A liquid in the stomach
What does physical digestion in the stomach do ?
Increases surface area to allow enzymes digest the food easier
What is pepsinogen?
An inactive enzyme formed by glands in the lining of the stomach by HCL
WHAT is the pH of the stomach?
PH of 2
The enzyme pepsin breaks down
Protein to peptides
How is the stomach prevented from self digestion?
Protective mucus
What activates pepsin
When mix with HCL in stomach
