SH Practical - Lymphatic Quiz

From Embryology

Here are a few simple questions that relate to your lecture and Lymphatic Structure and Organs practical, this page is not a part of the lecture or practical class.

You should try in your own time after completing the Practical today.

Answer all the questions before clicking submit.

Take the Quiz

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{Lymph is carried towards an lymph node by: |type="()"} +   afferent lymph vessels || Yup. -   efferent lymph vessels || Nope. But remember these terms are a functional description relative to the vessel for that specific node. In a chain, the efferent vessel from one node can become the afferent lymph vessel of the next node.

{The most abundant white blood cells as a percentage of all cells in normal circulation are the |type="()"} -   lymphocytes -   basophils -   monocytes -   eosinophils +   neutrophils || Neutrophils, of course. Here they are in order from the table in the practical class: 60% neutrophils (50% - 70%) 30% lymphocytes (20% - 40%) 3% eosinophils (>0% - 5%) 5% monocytes (1% - 9%) 0.5% basophils (>0% - 2%)

{Plasma cell EM06.jpg Why does this lymphocyte shown in this EM contain lots of RER? |type="[]"} -   Because its a cytotoxic T lymphocyte || T lymphocytes have mainly free ribosomes, not attached to endoplasmic reticulum. -   Because its a monocyte || This is not even a lymphocyte. This is the circulating form of a tissue macrophage. -   Because its a macrophage +   Because its a Plasma cell || Yes plasma cells are actively secreting antibody by therefore ribosomes attach to the endoplasmic reticulum as the first step in the exocytosis pathway. +   Because its a B lymphocyte || Well it is also a B lymphocyte, just in its "activated" form (plasma cell, plasmocyte or effector B cell).

{In normal peripheral blood which the most abundant lymphocyte cell type? |type="()"} +   T cells || 60 - 80% of lymphocytes are T cells. 50/50 Questions are far to easy...... -   B cells || 10 - 15% are B cells, the remainder lack both B and T cell markers (Natural killer cells, null cells).

{Reticular fibres are composed of type III collagen and secreted by reticular cells. Which of the following statements are correct about reticular fibres? |type="[]"} +   Reticular fibres are very delicate and form fine networks instead of thick bundles. || These fibres are present in many different connective tissues, but are not easily identified in most histological stains. Note the alternate American spelling reticular fiber. +   Reticular fibres give support to individual cells. ||   Their dimensions and distribution allow then to support cells in tissues. +   Reticular fibres stain black in silver stained preparations. || Silver Stain is the stain for these argyrophilic ("silver loving") reticular fibres. +   Reticular fibres form open meshwork's allowing the exchange of substances and cell movement. || Spleen reticular fibres show cords supporting cells and also lining the blood sinuses.

{Spleen histology 08.jpg
Which of the following best describes the spleen histology and feature shown in the above histological image? |type="()"} +   Spleen white pulp germinal centre || Yes! here is white and red pulp shown together. -   Spleen red pulp splenic sinuses || No. This is what red pulp looks like -   Spleen reticular fibres and sinuses || No, well sinuses may be in the edges of the image, and reticular fibres are not even identifiable. Did you answer the reticular fibre question correctly? Here is an image of reticular fibres stained in the white and red pulp. -   Its not spleen at all, but a lymph node follicle. || Well no, I did say it was spleen. This is what a follicle looks like, though they also have germinal centres.

{Which of the following sequences best describes the pathway of lymph fluid through a lymph node |type="()"} +   Subcapsular sinus -> Paratrabecular sinus -> Medullary sinus -> Efferent vessel -   Subcapsular sinus -> Paratrabecular sinus -> Medullary sinus -> Afferent vessel -   Subcapsular sinus -> High endothelial venule -> Medullary sinus -> Thoracic duct -   Subcapsular sinus -> Medullary sinus -> Paratrabecular sinus -> Hilum vessel

{Lymph node histology 05.jpg
Which of the following descriptions best describes the function of High endothelial venules? |type="()"} -   Act as a site for the distribution of macrophages in lymph nodes -   Drain lymph fluid from secondary lymph organs -   Specialised blood vessels in the spleen +   Specialised site for lymphocyte extravasation || HEVs extravasation


Links: SH Practical - Lymphatic Structure and Organs | SH Lecture - Lymphatic Structure and Organs