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Quiz Three
PPT/Module
38
Physiology
Undergraduate 3
09/12/2012

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Cards

Term
How can you overcome activation energy? 2 ways
Definition
large amounts of heat, enzymes
Term
When does the enzyme become denatured?
Definition
when temperature increases
Term
pH optimum
Definition
enzymes exhibit a peak activity within a narrow pH range
Term
If salt concentration is close to zero, how does the amino acid react?
Definition
chains will attract one another: the enzyme will denature and form an inactive precipitate
Term
If the salt concentration is too hihg,
Definition
normal interaction of charged groups will be blocked: enzyme will denature and form an inactive precipitate
Term
Inorganic ions may alto interact with the active site
Definition
by disrupting the H binding and binding to the surround ionic residues
Term
cofactors help to
Definition
change the active site
Term
Mastication
Definition
Chewing
Term
Deglutination
Definition
swallowing
Term
segmentation
Definition
churning/mixing
Term
Exocrine secretion
Definition
digestive enzymes, acid, and mucus
Term
Endocrine secretion
Definition
hormones to regulate digestion
Term
absorption
Definition
transport of nutrients into blood or lymph
Term
Digestive tracts functions
Definition
storage and elimination, and immune barrier
Term
What digests carbs?
Definition
salivary amylase
Term
What digests starch in the small intestine?
Definition
pancreatic amylase
Term
Goblet cells
Definition
secrete mucous, and protect against digestion of epithelium
Term
Chief cells
Definition
Secrete pepsinogen
Term
What is pepsinogen?
Definition
an inactive form of pepsin that is activated by pepsin and HCl
Term
Zymogen
Definition
an inactive enzyme precursor
Term
What is pepsinogen?
Definition
a zymogen
Term
Parietal cells secrete what
Definition
HCl
Term
What activates pepsin
Definition
Hcl
Term
what is used to absorb B12 in the small intestine?
Definition
glycoprotein
Term
What breaks down large polypeptides?
Definition
pancreatic enzymes
Term
What breaks down small polypeptides and small peptides?
Definition
brush order enzymes
Term
Where is breakdown of protein
Definition
stomach
Term
What is digested in the small intestine?
Definition
large polypeptide, small polypeptides
Term
Where are amino acids absorbed/how
Definition
in the stomach: they are absorbed by cotransport with NA ions
Term
What are absorbed via cotransport with H+ and hydrolyzed to amino acids within the cells?
Definition
dipeptides and tripeptides
Term
How do amino acids leave the cell?
Definition
by facilitated diffusion, they then enter the capillary blood in the villi and are transported to the liver via the hepatic portal vein
Term
Where does lipid digestion begin?
Definition
the small intestine
Term
Where are lipids completely digested and how?
Definition
the small intestine and by pancreatic lipase
Term
Where do you find villi and microvilli?
Definition
the small intestine
Term
What is absorbed in the large intestine?
Definition
Water, electrolytes, vitamin K, and some B vitamins
Term
What are necessary for synthesis of various essential nutrients?
Definition
microflora: K, B, and Folic Acid
Term
Does digestion occur in the large intestine?
Definition
no
Term
What enzymes are in the small intestine?
Definition
trypsin, chymotrypsin, carboxypeptidase, pancreatic lipase, maltase, sucrase, lactase, aminopeptides
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