Revision Questions Part 2 Flashcards
What is Eosinophil ?
white blood cell containing granules that are readily stained by eosin.
role in host defence against nematodes and other parasitic infections and are active participants in many immune responses.
Defence against parasitic infections
Defence against intracellular bacteria
Modulation of immediate hypersensitivity reactions
What is Basophil ?
The granules store and release enzymes and chemicals, specifically histamine, that promote the widespread inflammatory reaction characteristic of basophils.
activated when infectious organisms enter the body. They work together with other white blood cell types, each of which has its own enzymes and chemicals, to defend against invading microorganisms.
Collagen Fibres
type of protein fiber found abundantly throughout our body. It provides strength and cushioning to many different areas of the body, including the skin.
Each of these fibrils is composed of microfibrils, which are only visible using electron microscopy
Elastic Fibres
Elastic fibers (or yellow fibers) are bundles of proteins (elastin) found in extracellular matrix of connective tissue and produced by fibroblasts and smooth muscle cells in arteries.
Loose and dense irregular connective tissue, formed mainly by fibroblasts and collagen fibers, have an important role in providing a medium for oxygen and nutrients to diffuse from capillaries to cells, and carbon dioxide and waste substances to diffuse from cells back into circulation.
Reticular Fibres
fibers form a soft skeleton (stroma) to support the lymphoid organs (lymph node stromal cells, red bone marrow, and spleen). Adipose tissue is held together by reticular fibers.
They are usually not visible in histological sections but can be demonstrated by using special stains.
Cross-striations with the same periodicity as in coarse collagen fibres are however visible using electron microscopy. Same as Collagen
Connective tissue type
Loose connective tissue and dense connective tissues.
How are they distinguished ?
Are distinguished according to the relative amounts of fibres they contain
White Adipose tissue
does not only function in the storage of lipids.
n the palms of the hands, on the plantar surface (sole) of the feet and in the gluteal region (buttocks) it has a structural, cushioning function.
white adipose tissue is different in males and females and is part of the secondary sexual characteristics.
Brown Adipose tissue
Occurs mainly during development and may account for 2 - 5 % of the body weight in a newborn.
In adult individuals most of the brown fat has further differentiated into white fat.
A protein (UCP-1 or thermogenin) found in these mitochondria decouples the oxidation of fatty acids from the generation of ATP. Instead, these cells generate heat.
Adipocytes in brown fat contain plenty of mitochondria. A very rich capillary supply and the cytochromes found in the mitochondria give the tissue its characteristic colour
Loose Connective
It is relatively cell rich, soft and compliant.
It is also rich in vessels and nerves.
hold organs in place and attaches epithelial tissue to other underlying tissues. It also serves as a reservoir of water and salts for surrounding tissues. Almost all cells obtain their nutrients from and release their wastes into areolar connective tissue.
Dense connective
Connective tissue is the most abundant tissue in the human body and forms all tendons and ligaments,
forms strong, rope-like structures such as tendons and ligaments. … Ligaments are more stretchy and contain more elastic fibers than tendons.
Simple Cuboidal Epithelium tissue
Secretion and absorption
Located in the Kidney
Stratified Squamous epithelium tissue
Protects underlying tissues
Located in mouth,vagina,urthera and anus
Hyaline Cartilage
Provide durable protection and supports movable joints
Fibro Cartilage
Tensile strength with the ability to absorb compressive shock .
