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Multiple choice biology soldiers of defense human lymphatic system lymph and its function lymph and tissue fluid

Lymph

  1. Transports $O _2$ to brain
  2. Transports $CO _2$ to lungs

  3. Returns interstitial fluid to blood

  4. Returns RBCs and WBCs to lymph nodes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Lymph is a fluid connective tissue that contains plasma and WBCs (mostly lymphocytes). It lacks RBCs and contains more WBCs and proteins. It is colourless and contains very small amount of nutrients and oxygen. It is known as middle man of the body. Its function is to return the interstitial fluid and proteins back to the blood.
So, the correct answer is 'Return interstitial fluid to the blood'.
Multiple choice biology soldiers of defense human lymphatic system lymph and its function lymph and tissue fluid

Lymph is colourless because

  1. WBC are absent

  2. WBC are present

  3. Haemoglobin is absent

  4. RBC are absent
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Lymph is the part of the lymphatic system, which is a colourless watery fluid which contains lymphocytes and proteins.
  • They are colourless because they lack red blood cells. 
  • The red blood cells contain haemoglobin protein which gives a red colour to the blood. So, the correct answer is 'RBC are absent'.
Multiple choice biology soldiers of defense human lymphatic system lymph and its function lymph and tissue fluid

Middle man of the body is

  1. Plasma

  2. Lymph

  3. WBC

  4. RBC
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Lymph is a mobile connective tissue and composed of white blood cells mostly lymphocytes, and, the lymph plasma. It is similar to blood but it has less proteins, calcium and phosphorus. Glucose level is high in lymph. It is formed in lymph nodes, liver, thymus, tonsils, spleen and peyers patches with liver being the largest producer. It acts as middle man of body. It transports oxygen, food materials, hormones etc. to body cells and brings metabolic wastes like carbon dioxide from the body cells to blood which are finally poured into the venous system. In this way, it mediates the exchange and hence, known as middle man of the body.
So, the correct answer is 'Lymph'.
Multiple choice biology soldiers of defense human lymphatic system lymph and its function lymph and tissue fluid

Which one is called graveyard of RBC's?

  1. Liver

  2. Kidney

  3. Heart

  4. Spleen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Spleen is called the graveyard of RBCs because after completion of lifespan, RBCs are destroyed in spleen where they are ingested by free macrophages. About 2.5 million of RBCs are destructed in one second. After ingestion of RBCs by macrophages, the haemoglobin is dissociated into haem and globin. Iron of haem is released which is further used in process of formation of blood. The haem is converted into bilirubin, a yellow or brown pigment.
So, the correct answer is 'Spleen'.
Multiple choice biology soldiers of defense human lymphatic system lymph and its function lymph and tissue fluid

Which of the following is blood bank of the body or reservoir, where the blood is stored and can be mobilized?

  1. Heart

  2. Liver

  3. Bone marrow

  4. Spleen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The spleen is an organ in the upper far left part of the abdomen, to the left of the stomach. It’s commonly fist-shaped, purple, and about 4 inches long.
It is known as the blood bank because its blood reserve can be valuable in case of hemorrhagic shocks. 
It acts as a filter for blood as part of the immune system. Old red blood cells are recycled in the spleen, and platelets and white blood cells are stored there. The spleen also helps fight certain kinds of bacteria that cause pneumonia and meningitis. Hence, the correct answer is option D.