Podcast
Questions and Answers
What is the main reason why drug transport through skin is possible?
What is the main reason why drug transport through skin is possible?
- The watery nature of the stratum corneum
- The hairy nature of the skin
- Lipoid nature of the intercellular medium (correct)
- The presence of sebaceous glands
Which transport route involves the movement of drugs between corneocytes?
Which transport route involves the movement of drugs between corneocytes?
- Trans-appendageal route
- Intracellular route
- Intercellular route (correct)
- Transcellular route
What is the primary lipid component of the intercellular medium?
What is the primary lipid component of the intercellular medium?
- Phospholipids (correct)
- Cholesterol
- Fatty acids
- Ceramide
Which route of transport is suitable for small molecules only?
Which route of transport is suitable for small molecules only?
What is the primary function of sebaceous glands in skin transport?
What is the primary function of sebaceous glands in skin transport?
What is the term for transport through hair follicles and sebaceous glands?
What is the term for transport through hair follicles and sebaceous glands?
Which route of transport involves the movement of drugs through corneocytes?
Which route of transport involves the movement of drugs through corneocytes?
What is the most abundant route of drug transport through the skin?
What is the most abundant route of drug transport through the skin?
What is the primary obstacle in drug permeation through the skin?
What is the primary obstacle in drug permeation through the skin?
What is transappendageal transport?
What is transappendageal transport?
Which type of transport is also known as shunt route transport?
Which type of transport is also known as shunt route transport?
What are the skin appendages responsible for transappendageal transport?
What are the skin appendages responsible for transappendageal transport?
What is the term for the movement of a drug within a membrane composed of more than one layer?
What is the term for the movement of a drug within a membrane composed of more than one layer?
What is the advantage of transappendageal transport?
What is the advantage of transappendageal transport?
What is the unit of drug permeation through a membrane?
What is the unit of drug permeation through a membrane?
Which of the following is an example of transcellular transport?
Which of the following is an example of transcellular transport?
Why is the sweet gland route not influential to drug transport?
Why is the sweet gland route not influential to drug transport?
What is the disadvantage of transappendageal transport?
What is the disadvantage of transappendageal transport?
What is the term for the routes of drug permeation through the skin?
What is the term for the routes of drug permeation through the skin?
What happens to the drug molecules after they enter the sweat glands?
What happens to the drug molecules after they enter the sweat glands?
Which type of transport is considered EASY and FAST but LESS COMMON?
Which type of transport is considered EASY and FAST but LESS COMMON?
What is the role of the blood capillaries surrounding the sweat glands and sebaceous glands?
What is the role of the blood capillaries surrounding the sweat glands and sebaceous glands?
What is the name of the outermost layer of the skin that is a significant barrier to drug permeation?
What is the name of the outermost layer of the skin that is a significant barrier to drug permeation?
What happens to the drug molecules after they enter the hair follicles and sebaceous glands?
What happens to the drug molecules after they enter the hair follicles and sebaceous glands?
Study Notes
Skin Permeation Pathways
- Lipoid nature of drugs allows them to pass easily through sweet glands, hair follicles, and sebaceous glands
- Targeted effect is needed for shunt transport through hair follicle and sebaceous glands routes
- Skin permeation pathways refer to the routes of drug permeation through the skin
Transport Through Stratum Corneum
- Most abundant route of drug transport through the skin
- Two main routes:
- Intercellular route: drug moves between corneocytes till it reaches viable epidermis
- Transcellular route: drug moves through corneocytes till it reaches viable epidermis
Intercellular Route
- Intercellular medium is lipid in nature, composed of phospholipids, ceramide, and cholesterol
- Suitable for small molecules with a molecular weight of less than 400 dalton
- Permeation coefficient (P) expresses the rate of drug permeation through the membrane
Transappendageal Transport (Shunt Route)
- Drug transport through skin appendages (sweet glands, hair follicles, and sebaceous glands)
- Easy and fast pathway, but less common
- Advantage: no barrier effect of stratum corneum, but disadvantage: rare route with insignificant contribution to drug transport
Transport Through Sweet Glands and Hair Follicles
- Transport through sweet glands:
- Drug molecules enter sweet openings
- Travel through sweet ducts
- Reach sweet glands
- Absorbed by blood capillaries surrounding sweet glands
- Transport through hair follicles and sebaceous glands:
- Drug molecules enter hair openings
- Travel through sebaceous sacs
- Reach sebaceous glands
- Absorbed by blood capillaries surrounding sebaceous glands
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Description
This quiz covers the lipoid nature of certain drugs, how they pass through the skin, and the routes of skin permeation, including sweet glands and hair follicles. It's essential for understanding targeted drug effects.
