Chapter 5: Nutrition in Humans
Nutrition: Get Energy & Food
Why?
Growth
Repair & Maintenance of the body
Process Involve: Ingestion > Digestion > Absorption & Assimilation > Egestion
Alimentary Canal
Organs
Where food will pass through
Mouth, Oesophagus, Stomach, Small & Large Intestine, Anus
An accessory
Liver, Gall Bladder, Pancreas
Small Intestine
Duodenum > Jejunum > Ileum
Protein only is digested (broken down) as it is very acidic. The others such as carbohydrates and fats won't digest as the enzymes will be denatured as they can't be in an acidic environment.
Peristalsis: Muscle Contraction & Muscle Relax
Amino acid breaks down the proteins in the duodemun
Pancreatic Juice, Bile, Intestinal Juice
Digestion
Mechanical/Physical
-E.g: Mouth
-Large > Small
-Chewing/ Churning
Chemical
-Chemical Change
-Enzymes
-Complex > Simpler
Absorption: -Increase Surface Area : Volume
-Thickens of Separating Membrane
-Concentration Gradient
Mitochondria stored energy/ gives energy from glucose