12 Questions
Where is simple columnar epithelium often found?
Intestinal lining
Which type of epithelium appears to have several layers but is actually a single layer?
Pseudostratified columnar epithelium
Which type of connective tissue provides strength and flexibility?
Dense connective tissue
What is the main function of fibroblasts in connective tissue?
Secrete fiber proteins
Where are mast cells found in connective tissues?
Secrete heparin and histamine
What type of fiber is responsible for making tissues elastic?
Elastic fibers
Which type of animal tissue is specialized for absorption of nutrients and respiratory gases?
Simple squamous epithelium
What is a characteristic of epithelial tissue regarding blood vessels?
Lacks blood vessels within the tissue
Which type of epithelial tissue is described as having a single layer with dice-shaped cells?
Simple cuboidal epithelium
What function is NOT associated with epithelial tissue?
Storage of excess fat
Which type of epithelial tissue is found in blood capillaries and alveoli?
Simple squamous epithelium
What distinguishes compound epithelia from simple epithelia?
Presence of numerous cell layers
Study Notes
Animal Tissues and their Functions
Epithelial Tissue
- Covers external or internal free surfaces and organs
- Cells are closely packed and have both apical and basal surfaces
- Apical surface remains free, and basal surface is attached to the basement membrane
- No blood vessels in the tissue; gets nutrients and oxygen from underneath connective tissue
- Functions: protection, secretion, and absorption
- Two types: simple epithelia (single cell layer) and compound epithelia (several cell layers)
Simple Epithelia
- Simple squamous epithelium: single layer, plate-like cells, thin and leaky, found in blood capillaries, alveoli
- Simple cuboidal epithelium: single layer, dice-shaped cells, specialized for secretion, found in kidney tubules, many glands
- Simple columnar epithelium: single layer, large and brick-shaped cells, often found in places where secretion or active absorption is important
- Pseudostratified columnar epithelium: single cell layer, cells of different height, nuclei at different levels, appear as several layers, found in nasal passage, trachea
Compound Epithelia
- Stratified squamous epithelium: multiple layers, rapid regeneration, old cells sloughed off, new cells produced, found in outer skin, lining of mouth, anus, vagina
Connective Tissue
- Most abundant tissue in the body, connects organs and tissues structurally and functionally
- Consists of different types of cells scattered in a large amount of extracellular matrix containing different types of fibers
- Matrix may be semisolid, liquid, or solid (dense and rigid)
- Cells in the matrix: fibroblasts, macrophages, mast cells, fat cells, and leukocytes
- Three types of fibers: collagen fibers (strength and flexibility), reticular fibers (join connective tissues to adjacent tissues), and elastic fibers (elasticity)
- Functions: binding and structural support, protection, transport of materials, insulation
- Different types of connective tissues: loose connective tissue (areolar tissue), fibrous connective tissue (dense connective tissue), adipose tissue, blood, cartilage, and bone
Test your knowledge on the structure and function of the four major types of animal tissues: Epithelial tissue, Connective tissue, Muscle tissue, and Nervous tissue. Learn about the characteristics and functions of each tissue type.
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