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Tissue and Epithelium Essentials
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1
Question
What is a tissue in biological terms?
Page 2
Answer
A group of organized, similar cells closely associated to perform specific functions
2
Question
What branch of biology studies tissues?
Page 2
Answer
Histology
3
Question
What are the four basic types of animal tissues?
Page 2
Answer
Epithelial, connective, muscular, nervous
4
Question
What is the primary function of epithelial tissue?
Page 3
Answer
Covers body surfaces, lines cavities, and forms glands
5
Question
What role does connective tissue play in the body?
Page 3
Answer
Supports and sustains the other three basic tissues structurally and functionally
6
Question
What is the main responsibility of muscular tissue?
Page 3
Answer
Composed of contractile cells responsible for movement
7
Question
What does nervous tissue do?
Page 3
Answer
Receives, transmits, and integrates information to control organism activities
8
Question
Is epithelial tissue vascular or avascular?
Page 5
Answer
Avascular but innervated
9
Question
Where is epithelial tissue commonly found?
Page 5
Answer
Outer layer of skin, linings of digestive, respiratory, excretory, and reproductive tracts; forming glands
10
Question
How does epithelial tissue renew itself?
Page 5
Answer
Constantly through mitosis
11
Question
What are common modifications in epithelial cells?
Page 5
Answer
Microvilli, cilia, stereocilia
12
Question
What are the main functions of epithelial tissue?
Page 5
Answer
Protection, absorption, secretion, sensation
13
Question
How is epithelial tissue classified by number of layers?
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Answer
Simple (one layer), stratified (multiple layers), pseudostratified (appears multiple but one layer)
14
Question
How is epithelial tissue classified by cell shape?
Page 6
Answer
Squamous (flat), cuboidal (cube-like), columnar (cylindrical)
15
Question
Where is simple squamous epithelium located?
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Answer
Alveoli of lungs, loop of Henle and Bowman's capsule (kidneys), endothelium of blood and lymphatic vessels, inner ear, mesothelium of pleural and peritoneal cavities
16
Question
What are the functions of simple squamous epithelium?
Page 7
Answer
Acts as limiting membrane and coating; reduces friction between organs; gas exchange by diffusion
17
Question
Where is stratified squamous epithelium found?
Page 7
Answer
Epidermis, mouth surface, vocal cords, epiglottis, esophagus, anus, vagina
18
Question
What are the functions of stratified squamous epithelium?
Page 7
Answer
Protection; may secrete mucus
19
Question
Where is simple cuboidal epithelium located?
Page 7
Answer
Renal tubules, ducts of many glands, ovary surface, pancreas, liver
20
Question
What are the functions of simple cuboidal epithelium?
Page 7
Answer
Absorption and secretion
21
Question
Where is simple columnar epithelium found?
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Answer
Stomach, esophagus, intestine, uterus, ducts of exocrine glands
22
Question
What are the functions of simple columnar epithelium?
Page 8
Answer
Transport, absorption, and secretion of substances; protection; may be ciliated
23
Question
Where is pseudostratified columnar epithelium located?
Page 8
Answer
Oviduct, epididymis, male urethra; ciliated in respiratory tract (trachea, bronchi, nasal cavity)
24
Question
What are the functions of pseudostratified columnar epithelium?
Page 8
Answer
Protection and conduction
25
Question
What is glandular epithelium?
Page 8
Answer
Epithelial cells specialized to secrete products like sweat, milk, mucus, wax, saliva, hormones, or enzymes
26
Question
What are exocrine glands?
Page 9
Answer
Secret products onto free epithelial surface via ducts; examples: goblet cells, sweat, mammary, salivary, sebaceous, ceruminous glands
27
Question
What are endocrine glands?
Page 9
Answer
Lack ducts; release hormones into interstitial fluid or blood, transported by cardiovascular system
28
Question
What is a mucosal membrane?
Page 10
Answer
Lines body cavities open to the exterior, like digestive or respiratory tracts
29
Question
What is a serous membrane?
Page 10
Answer
Lines body cavities not open to exterior; secretes fluid into the cavity; examples: pleural (around lungs), pericardial (around heart)
30
Question
What distinguishes simple from stratified epithelium?
Page 6
Answer
Simple has one layer; stratified has multiple layers