Tissues and epithelia
The four basic tissues, then the epithelia in detail: lining or glandular, simple or stratified, squamous, columnar or pseudostratified, their basement membrane and junctions, and what pathology draws from them (metaplasia, carcinoma).
- 34 cards
- 3 topics
- Free
The outline, topic by topic
Each topic is weighted the way the exam weighs it.
- Concepts
- Scenarios
- Understand
A few cards from the deck
The four basic tissues: what is it?
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Epithelial, connective, muscle and nervous: every organ is built from them.
An organ always combines several tissues.
In a heavy smoker, the bronchial epithelium turns stratified squamous. What is this change called?
- Metaplasia
- Necrosis
- Atrophy
- Hypertrophy
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Metaplasia
One epithelium is replaced by another, tougher but without cilia: it is a breeding ground for cancer.
Lining epithelium: what is it?
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A layer of tightly joined cells lining a surface or a cavity.
It protects, absorbs or secretes depending on its shape.
Why is skin a stratified epithelium and the alveolus a simple one?
- By chance
- Skin is younger
- The alveolus is more exposed
- Skin must withstand friction, the alveolus must let gases through
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Skin must withstand friction, the alveolus must let gases through
The epithelium's shape follows its function.
Glandular epithelium: what is it?
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An epithelium specialised in secretion: exocrine if it empties into a duct, endocrine if into blood.
The pancreas is both exocrine (digestive juice) and endocrine (insulin).
A cancer arising from an epithelium is called…
- A sarcoma
- A carcinoma
- A lymphoma
- A glioma
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A carcinoma
A sarcoma arises from connective tissue, a lymphoma from lymphocytes.