Podcast
Questions and Answers
Which of the following is an incorrect sentence?
Which of the following is an incorrect sentence?
- The bulb is home to several types of stem cells that divide every 23 to 72 hours, faster than any other cells in the body.
- The follicle is surrounded by an inner and outer sheath that protects and molds the growing hair shaft. The inner sheath follows the hair shaft and ends just before the opening of the sebaceous gland.
- Sebum production continues almost at the same rate throughout life (correct)
- The follicle contains the germinal matrix, which is where cells produce new hairs.
- The bulb also contains hormones that affect hair growth and structure during different stages of life, like puberty.
Based on the given description, what is described?
Based on the given description, what is described?
- Cuticule (correct)
- Matrix
- Medulla
- Cortex
- Microfibriles
What occupies the greatest proportion of the hair’s cross-sectional area (75%)?
What occupies the greatest proportion of the hair’s cross-sectional area (75%)?
- Cortex (correct)
- Cuticule
- Microfibriles
- Medulla
- Matrix
What is the function of the medulla layer of hair?
What is the function of the medulla layer of hair?
Which component of the hair is responsible for resistance to twisting and is sensitive to water?
Which component of the hair is responsible for resistance to twisting and is sensitive to water?
During which phase is active cell division most active, covering about 85-90% of follicles?
During which phase is active cell division most active, covering about 85-90% of follicles?
Which statement about hair characteristics is incorrect?
Which statement about hair characteristics is incorrect?
What is the composition of enamel, the outer layer of a tooth's crown?
What is the composition of enamel, the outer layer of a tooth's crown?
Which material has been shown to reduce the fungus that causes dandruff and seborrheic dermatitis?
Which material has been shown to reduce the fungus that causes dandruff and seborrheic dermatitis?
What group of materials removes materials from various body surfaces, aids mechanical tooth cleaning, or improves gloss by making the surface smooth and even?
What group of materials removes materials from various body surfaces, aids mechanical tooth cleaning, or improves gloss by making the surface smooth and even?
What is the primary function of the nail plate?
What is the primary function of the nail plate?
Which phase lasts 3-4 months and involves the formation of club hair followed by shedding?
Which phase lasts 3-4 months and involves the formation of club hair followed by shedding?
Which component of the hair is responsible for making it more elastic in water?
Which component of the hair is responsible for making it more elastic in water?
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Study Notes
Hair Structure and Functions
- The cross-sectional area of hair is primarily occupied by the cortex, which constitutes about 75% of the hair's structure.
- The medulla layer provides structural support and may assist in insulation, although its exact function in human hair is not fully understood.
- The cuticle is responsible for the hair's resistance to twisting and sensitivity to water, playing a crucial role in protecting inner structures.
Hair Growth Phases
- The anagen phase is characterized by active cell division, encompassing 85-90% of hair follicles during this growth period.
- The telogen phase, lasting 3-4 months, culminates in the formation of club hair before shedding occurs.
Hair Characteristics and Composition
- Identify and correct incorrect statements regarding hair characteristics for critical understanding.
Dental Enamel Composition
- Enamel, the outer layer of a tooth's crown, is mainly composed of hydroxyapatite, a crystalline structure that provides strength.
Hair and Scalp Health
- Zinc pyrithione has shown effectiveness in reducing the fungus associated with dandruff and seborrheic dermatitis.
Oral Hygiene Materials
- Abrasives are materials designed to remove substances from body surfaces and assist in the mechanical cleaning of teeth, enhancing surface smoothness and gloss.
Nail Functions
- The primary function of the nail plate is to protect the underlying nail bed and support the fingertip.
Hair Elasticity
- The cortex also contributes to the elasticity of hair, especially when influenced by water.
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