Absorption

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1
What will the body do to a lipophilic xenobiotic in the body?
Undergo biotransformation and turn the xenobiotic into a hydrophilic compound so it favors excretion.
2
What are the properties of a plasma membrane?
The phospholipid bilayer consists of hydrophobic lipids and hydrophilic proteins.
3
What are the intermolecular forces?
Dispersion, Dipole Dipole, Hydrogen.
4
What is simple diffusion?
Nonpolar compounds down concentration gradient.
5
What is facillitated diffusion?
Compounds down electrochemical gradient.
6
What is primary active transport?
Compound against electrochemical gradient driven by ATP.
7
What is secondary active transport?
Against electrochemical gradient, driven by ion moving down its gradient.
8
What is Ion channel?
Down electrochemical gradient; May be gated by a ligand or ion.
9
What does ionization do to a compound?
It makes a compound more soluble in a polar solvent.
10
Explain pKa values...
Higher pKa means weak acid and low means strong acid.
11
Describe an acid in terms of protons and electrons...
Donates protons and accepts electrons.
12
What is the first pass effect?
When a drug concentration is metabolized in a specific area before reaching circulation or site of action.
13
What relationship do polar and nonpolar molecules have with water?
Polar molecules are hydrophilic, nonpolar molecules are hydrophobic.
14
How does surface area help absorption?
An large surface area allows for a greater volume of food intake and more efficient absorption of nutrients into the bloodstream.
15
What is the larynx and what does it do for the body?
A hollow tube in the middle of your neck that protects your airways from foreign material.
16
What is the stratum corneum? Function? Made of?
The skins outermost layer, barrier that prevents unwanted material from entering body. Keratin and lipids.
17
What does VD mean?
The amount of dosage that will stay in you bloodstream, and how lipid soluble something is.
18
What does a high VD value mean?
The substance is very lipid soluble.
19
What are the requirements for a molecule to be good at crossing a membrane barrier?
Small, uncharged and hydrophobic.
20
What is hydrolysis?
Adding water to a larger molecule to break it apart into 2 smaller molecules.
21
What does a KoW value under 1 mean?
Water soluble
22
What does a KoW value over 1 mean?
Lipid soluble
23
What is a oxidation reaction?
A chemical reaction that involves the loss of electron, gain of oxygen.
24
What is reduction reaction?
A chemical reaction that involves the gain of electron, loss of oxygen.
25
What is bilurubin? Why is it dangerous in high dosage?
Waste created from the breakdown or catabolism of old red blood cells through the liver. Toxic endogenous substance.
26
What is Glucuronidation? What phase is it apart of?
A natural detoxification process that your body does to get rid of toxic substances. Phase 2.
27
What does phase 2 metabolism do? (Conjugate reaction)
Adding hydrophilic or endogenous groups to the molecule to favor excretion.
28
What does phase 1 metabolism do?
Phase I metabolism consists of reduction, oxidation, or hydrolysis reactions.
29
What is the Kow value? What does a low or high value mean?
Equilibrium constant for water. Low value means high hydrophilicity and high means low affinity for water.
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