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Questions and Answers
What type of tissue regenerates poorly?
What type of tissue regenerates poorly?
What is the primary function of sebum produced by sebaceous glands?
What is the primary function of sebum produced by sebaceous glands?
What happens to muscle tissue by the end of puberty?
What happens to muscle tissue by the end of puberty?
What is the result of injury to amitotic tissues?
What is the result of injury to amitotic tissues?
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What is hyperplasia?
What is hyperplasia?
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What is the function of sweat glands?
What is the function of sweat glands?
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What is the current understanding of the cause of aging?
What is the current understanding of the cause of aging?
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What type of tissue becomes amitotic shortly after birth?
What type of tissue becomes amitotic shortly after birth?
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Study Notes
Regeneration of Tissues
- Epithelial tissue (skin and mucous membranes) and fibrous connective tissues and bone regenerate easily.
- Skeletal muscle regenerates poorly.
- Cardiac muscle and nervous tissue within the brain and spinal cord are replaced largely with scar tissue.
Developmental Aspects of Cells and Tissues
- Growth through cell division continues through puberty.
- Cell populations exposed to friction (such as epithelium) replace lost cells throughout life.
- Connective tissue remains mitotic and forms repair (scar) tissue.
- Muscle tissue becomes amitotic by the end of puberty, except for some exceptions.
- Nervous tissue becomes amitotic shortly after birth.
- Injury can severely handicap amitotic tissues.
Aging and Neoplasms
- The cause of aging is unknown, but chemical and physical insults, as well as genetic programming, have been proposed as possible causes.
- Neoplasms, both benign and cancerous, represent abnormal cell masses in which normal controls on cell division are not working.
- Hyperplasia (increase in size) of a tissue or organ may occur when tissue is strongly stimulated or irritated.
- Atrophy (decrease in size) of a tissue or organ occurs when the organ is no longer stimulated normally.
Glands of the Integumentary System
- Sebaceous (oil) glands are found throughout the entire body except for palms and soles, and produce sebum by holocrine secretion to oil and lubricate.
- Sweat glands are found on the entire skin surface except for nipples and part of external genitalia, and help prevent overheating, producing 500 cc to 12 l/day.
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Description
Explore the regeneration capabilities of different tissue types, including epithelial, fibrous connective, skeletal muscle, and cardiac muscle. Learn about growth and cell division through puberty and beyond.
