Sunday, 21 July 2013

Biology's Assignment: The Lymphatic System [sample complete answer]


Well, sharing is nice right? 
so this is for the readers's knowledge and of course mostly for me too. *because i love to open and read in the blog.

biology assignment questions:

1. briefly explain the flow of lymph fluid in body system


The lymph is moved through the body in its own vessels making a one-way journey from the interstitial spaces to the subclavian veins at the base of the neck.
Since the lymphatic system does not have a heart to pump it, its upward movement depends on the motions of the muscle and joint pumps.
As it moves upward toward the neck the lymph passes through lymph nodes which filter it  to remove debris and pathogens. 
The cleansed lymph continues to travel in only one direction, which is upward toward the neck.
At the base of the neck, the cleansed lymph flows into the subclavian veins on either side of the neck. 

source: the lymphatic system


2. briefly describe lymphatic organs in our body system

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The lymphatic system includes a system of lymphatic capillaries, vessels, nodes, and ducts that collects and transports lymph, which is a clear to slightly yellowish fluid, similar to the plasma in blood.The lymphoid organs assist the lymphatic system. They include the thymus, spleen, tonsils, and appendix, along with some special tissue in the gut.

       The thymus is located in the thoracic cavity, just under the neck. It’s made up of two lobes of lymphoid tissue. Each lobe has a medulla surrounded by a cortex. The cortex is where immature lymphocytes first go to become T cells, but their maturation finishes in the medulla.

      The spleen is located in the upper-left part of the abdomen. It’s tucked up under the ribs, so you generally can’t palpate it (medically examine by touch) unless it’s enlarged. The spleen’s main function is to filter the blood. It removes old or damaged red blood cells, which are phagocytized by macrophages. The spleen also detects viruses and bacteria and triggers the release of lymphocytes.

        The tonsils are masses of lymphoid tissue found in the back of the throat and nasal cavity. They’re part of the immune system, so they help fight infections, but removing the tonsils doesn’t appear to increase your risk of infections.

       The appendix is a pouch of lymphatic tissue that’s attached to the large intestine. It’s located in the lower-right area of the abdomen. Although it’s made of lymphatic tissue, the appendix doesn’t appear to have much lymphatic function in humans, but it does release some mucus into the large intestine.

        Some lymphatic tissue similar to the tonsils is also located in the digestive tract. Called gut associated lymphoid tissue (GALT), it comes in the following three varieties which are the Peyer’s patches, Lamina propria lymphocytes and Intraepithelial lymphocytes.

       Peyer’s patches are located in the mucosa and submucosa throughout the small intestine, although they’re more concentrated in the ileum. Peyer’s patches contain mostly B cells.

        Lamina propria lymphocytes is located in the mucosa of the small intestine. It also contains mostly B cells.

        Intraepithelial lymphocytes are located between the cells of the epithelial layer of the small intestine, between the tight junctions.



Have a nice weekend my fellow friends!


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1 comment:

  1. Akak pum dah belajar time sem 5 aritu. Best bljar topik ni.

    Good luck dik :D

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