Unit 2 Test
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What is appetite?
The psychological drive for food
What is hunger?
The physiological drive for food.
Which organ triggers feelings of hunger and satiation?
The hypothalamus
What effect do different macronutrients have on hunger?
Some make you feel more satiated than others.
What macromolecule has the highest satiety level?
Proteins
What macromolecule has the lowest satiety lever?
Carbohydrates
What is digestion?
When large molecules are broken down in to smaller molecules Mechanical Chemical
What is absorption?
When nutrients are absorbed in to the intestinal walls
What is elimination?
When waste products are excreted from the body through the anus
What is the difference between peristalsis is segmentation?
Periastalsis is the slow movement of food through the GI tract Segmentation is movement as well but is the mixing of chyme and material in the intestine.
What is the role of gastrin?
It is secreted by the stomach lining cells and it stimulates the gastric glands to produce gastric juice.
What are the two types of cells in the gastric glands?
Parietal cells Chief cells
What do parietal cells do?
Secret HCL and intrinsic factor
What do Chief cells do?
Secret pepsinogen and gastric lipase.
What dose gastric juice contain?
(HCL) Pepsin Gastric lipase Intrinsic factor
What dose HCL do?
Denatures proteins and activates pepsin
What dose pepsin do?
It’s the enzyme to digest protein Found in the pancreas
What dose gastric lipase do?
Enzyme to digest fats Found in the stomach
What dose intrinsic factor do?
Protein to absorb vitamin B12
What is the role of bicarbonate?
It neutralizes the acid and chyme
What dose salivary amylase do?
Digest carbohydrates Found in the mouth
What are the key hormones that aid in digestion?
Gastrin Secretin Cholecystokinin (CCK) Gastric inhibitory peptide (GIP)
What dose gastrin do?
Stimulates the secretion of HCL and pepsinogen
What dose secretin do?
Stimulates pancreatic bicarbonate