Tag: defence against infectious disease

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Multiple choice biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

Which one of the following is wrong?

  1. White blood cells or leucocytes are considered as 'soldiers' of the body.

  2. Antibodies are product by the stem cells of bone marrow.

  3. Calcium ions in blood play an important role in blood clot formation.

  4. Blood platelets are cell fragments, devoid of nuclei and participate in the coagulation of blood.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An antibody is a large, Y-shaped protein produced by the plasma cells that is used by the immune system to identify and neutralize pathogens such as bacteria and viruses. The antibody recognizes a unique molecule of the harmful agent (antigen), via the variable region. They are not formed by the stem cells. All the other statements are correct.
Therefore, the correct answer is option B.

Multiple choice biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

Blood clot inside a blood vessel is called as

  1. Thrombosis

  2. Agglutinin

  3. Clot

  4. Thrombus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The blood clot formed inside the blood vessel is called as a thrombus. When this thrombus breaks and travels to different parts of the body, then it is called embolus. Agglutinin is responsible for the agglutination.

Hence, the correct answer is 'Thrombus'

Multiple choice biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

Which of the following cells has a lifespan of 5-9 days?

  1. WBC

  2. Platelets

  3. RBC

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The platelets are formed by fragmenting from cells found in bone marrow called as megakaryocytes, and similar to red blood cells, they do not have a nucleus. The average lifespan of a platelet is normally just 5 to 9 days.  

Therefore, the correct answer is option B.

Multiple choice biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

Which of the following blood cells help in blood coagulation?

  1. RBCs

  2. Lymphocytes

  3. Thrombocytes

  4. Basophils
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Red blood cells or RBCs are the most common type of blood cell and contains hemoglobin, which is the principal means of delivering oxygen.
Lymphocyte is a type of white blood cell, that is important in the immune system.
Basophils are granulocytes i.e., they contain large cytoplasmic granules in the cell nucleus and it stores histamine (a vasodilator).
Thrombocyte is a platelet and is crucial for blood clotting.
Thus, the correct answer is option (C), 'Thrombocytes'.

Multiple choice biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

Formation of platelets is known as

  1. Haemopoiesis

  2. Thrombopoiesis

  3. Haemolysis

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Platelets or thrombocytes are cell fragments produced from megakaryocytes (special cells in the bone marrow). Formation of platelets by fragmentation of megakaryocytes in bone marrow is known as thrombopoiesis.

So, the correct answer is 'Thrombopoiesis'.

Multiple choice biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

Blood platelets are present in the blood of

  1. Fishes

  2. Amphibians

  3. Reptiles

  4. Mammals
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The blood cells are of three major types they are erythrocytes(RBC), leucocytes(WBC) and platelets. Platelets or thrombocytes are cell fragments produced from megakaryocytes (special cells in the bone marrow).Blood normally contains 1,500,00 - 3,500,00 platelets mm – 3. Platelets can release a variety of substances most of which are involved in the coagulation or clotting of blood.  Blood platelets are present in the blood of Mammals.

So, the correct answer is 'Mammals'.

Multiple choice biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

Blood platelets are

  1. Nucleated

  2. Nucleus is many lobed

  3. Nucleus is very small

  4. Denucleated
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The blood cells are of three major types they are erythrocytes(RBC), leucocytes(WBC) and platelets. Platelets or thrombocytes are cell fragments produced from megakaryocytes (special cells in the bone marrow). Formation of platelets by fragmentation of megakaryocytes in bone marrow is known as thrombopoiesis. As blood platelets are cell fragments they do not have any nucleus i.e Denucleated.

So, the correct answer is 'Denucleated'.

Multiple choice biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

Haemorrhagic disorder occurs when the platelet count falls to less than ________________.

  1. $1,50,000/mm^3$
  2. $1,00,000/mm^3$
  3. $75,000/mm^3$
  4. $50,000/mm^3$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hemorrhagic Disorders Spontaneous or near spontaneous bleeding caused by a defect in clotting mechanisms (blood coagulation disorders) or another abnormality causing a structural flaw in the blood vessels. Platelets play an important role in blood clotting, so thrombocytopenia puts you at higher risk of bleeding. Any time your platelet count drops below 50,000 per mm3 you are considered to be at increased risk for bleeding.


So, the correct answer is '50,000/mm3'.

Multiple choice biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

Which of the following blood cells help in blood coagulation?

  1. RBCs

  2. Lymphocytes

  3. Thrombocytes

  4. Basophils
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Thrombocytes are pieces of very large cells in the bone marrow called megakaryocytes. They help form blood clots to slow or stop bleeding and to help wounds heal.


So, the correct answer is 'Thrombocytes'.

Multiple choice biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

What is correct about the statements?
Statement A. Blood sugar level falls rapidly after hepatectomy
Statement B. Glycogen of liver is principal source of blood sugar

  1. Statement A and B correct with B being reason for A

  2. Statement A is correct but B is wrong

  3. Statement A is wrong but B is correct

  4. Both correct but B is not reason of A
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hepatectomy (removal of the liver) leads to a rapid fall in blood sugar because the liver is the primary site for glycogenolysis and gluconeogenesis. Statement B is technically incorrect because while the liver stores glycogen, the blood sugar level is maintained by both liver glycogen and gluconeogenesis, and the liver is not the only source.