Body Tissues Essay

1171 words - 5 pages

Epithelial Tissue
3 types of epithelial cells are:
1. Squamous
2. Ciliated
3. Goblet cells
Squamous Epithelial Cells
Squamous epithelial cells are generally round and flat with a small, centrally located nucleus. These cells line any surface that come in contact with the external environment and function as mediators of filtration and diffusion.
Ciliated Epithelial Cells
Ciliated epithelial cells have 200-300 small, hair like protrusions known as ‘cilia’ that can do one of two things at a time; they can help cells move along the tissue, or can help debris and waste to move along the surface of cells. Ciliated cells are most often found in the body’s air passages, this ...view middle of the document...

Red blood cells are mainly responsible for the transportation of oxygen and are released from bone marrow after 7 days of maturation.
White Blood Cells
White blood cells are round balls that have small points around the surface. White blood cells protect the body from harmful bacteria and pathogens by engulfing and ingesting the foreign substances.
Blood Platelets
Platelets are small, colourless and disk-shaped that helps the blood clotting process (coagulation). They’re found around the site of an injury, sticking to the lining of the injured blood vessel. If a person has a very high number of blood platelets then this would cause unnecessary clotting which can lead to a stroke or heart attack.
Cartilage
Cartilage is a hard, thick connective tissue that is found at the ends of bones, this helps to form joints.
There are 3 different types of cartilage, these are Hyaline, Elastic, and Fibrocartilage.
* Hyaline cartilage, also known as articular cartilage, is the most common cartilage throughout the body and if found in joints and on the edge of ribs, it is also responsible for the shape of the nose. It comprises large protein molecules (e.g. collagen) this forms the cartilage’s matrix. This is the prime material within this type of cartilage.
* Elastic cartilage has a lot of the same materials as hyaline, however for this cartilage the main component is elastic fibres, this gives it more flexibility. This type of cartilage is what ears are made of and is also found in the epiglottis (the part of the body that prevents food and drink from going through to the lungs.
* Fibrocartilage can be found in the knee joint and between the spinal vertebrae. It resists compression, limits relative movement and prevents bone-to-bone contact
http://www.todayifoundout.com/index.php/2014/02/ears-nose-continue-grow-age/
Our ears and nose are made completely of cartilage, as a result of this they never stop growing since Cartilage is made up of protein strands called collagen, this forms a tough, mesh-like framework that is filled with substances that hold water as a sponge would. When weight is placed on cartilage the water is squeezed out, and then when weight is taken off the water returns.
Bone
Bone is a thick, hard solid and makes up our bodies. Bones have many functions, these include:
* Metabolic functions where the bones help to store substances such as minerals (e.g. calcium)
* Mechanical functions where bones join together to form the skeleton that protects our organs, for example the skull protects the...

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