the opposing surfaces of bones that are connected via synovial joints are covered with a thin layer of ____________ .
1 answer:
Most articulating bones are covered with thin layers of articular cartilage.
Articulating bones are connected via synovial joints. This means that the articulating extremity of each bone will be contained in a synovial capsule. This capsule will contain a fluid necessary for healthy and mobile articulations, commonly referred to as synovial fluid.
The <u>opposing surfaces</u> of bones that are connected in this way contain a thin layer of articular cartilage. This cartilage, along with the presence of synovial fluid, allows bones to <u>move smoothly along one another and prevents harm to the actual bone tissue.</u>
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<h2><u>Full Question:</u></h2>
In the alveolus pictured above, a disease or injury to which structures would reduce the ability of oxygen to diffuse from the alveolar space to the capillary?
A. A and B
B. B and C
C. B and D
D. A and D
<h2><u>Answer:</u></h2>The correct answer is option D.
<h3><u>Explanation:</u></h3>Alveoli is defined as the unicellular thickened sac like structure of lungs which helps in exchange of gases in lungs. The exchange membrane of lungs comprise of three structures -
A. The epithelium cells of Alveoli,
B. The basement membrane of alveolar epithelium,
C. The endothelial layer of blood capillary.
The red blood cells described here won't cause any problems to the diffusion of gases from alveolar cavity to blood. The structures mentioned here as the type 2 cells of Alveoli which secrete lecithin, a surfactant which releases the surface tension of Alveoli. This compound prevents the Alveoli from collapsing and helps in diffusion of gases. The other structure mentioned here as D are the alveolar epithelium which is the unicellular thickened membrane of Alveoli, helping in gaseous exchange.