Tag: evs

Questions Related to evs

Mast cells of connective tissue contain

evs our body- its internal organ system leucocytes body fluids and immune responses respiratory and circulatory system

  1. Vasopressin and histamine

  2. Heparin and histamine

  3. Heparin and calcitonin

  4. Serotonin and melanin

Show answer
Correct Option: B
Explanation:

A  mast cell  is derived from the myeloid stem cell and contains many granules rich in histamine and heparin. Mast cells play an important role in allergy and anaphylaxis and are involved in wound healing and defence against pathogens. So, the correct answer is option B.

Which of the following statements are wrong ?
(a) Leucocytes disintegrate in the spleen and liver.
(b) RBC, WBC  and blood platelets are produced by bone marrow.
(c) Neutrophils bring about destruction and detoxification of toxins of protein origin.
(d) The important function of lymphocytes is to produce antibodies.

evs our body- its internal organ system leucocytes body fluids and immune responses respiratory and circulatory system

  1. a and b only

  2. a and d only

  3. a and c only

  4. b and c only

  5. b and d only

Show answer
Correct Option: C
Explanation:

Leucocytes do not disintegrate in spleen and liver, in fact they are produced in bone marrow.
Neutrophils are mainly responsible for protection against infection. When they come across the bacteria or any other foreign bodies, they engulf them through phagocytosis, thus playing a important role in cell defense. 

Which statement is true for WBC?

evs our body- its internal organ system leucocytes body fluids and immune responses respiratory and circulatory system

  1. Non-nucleted

  2. In deficiency, cancer is caused

  3. Can squeeze through blood capillaries

  4. None of the above

Show answer
Correct Option: C
Explanation:

WBC's are amoeboid in shape due to which they can easily squeeze through the walls of the capillaries at the site of injury by the process known as diapedesis and engulf the damaged cells by phagocytosis. They are nucleated cells and excess of WBCs causes cancer known as leukaemia. 

So, the correct answer is option C.

Spleen and thymus are haematopoietic for

evs our body- its internal organ system leucocytes body fluids and immune responses respiratory and circulatory system

  1. RBC

  2. WBC

  3. Platelets

  4. All of the above

Show answer
Correct Option: B
Explanation:
Haematopoiesis is the process of formation of blood cellular components. Blood cell formation takes place in yolk sac in developing embryo. As development proceeds, blood formation occurs in liver, spleen and lymph nodes. In spleen and thymus, 20-30% of WBCs are formed while RBCs and platelets are formed in the bone marrow.  All cellular blood components are derived from haematopoietic stem cells.

The main function of white blood cells is

evs our body- its internal organ system leucocytes body fluids and immune responses respiratory and circulatory system

  1. To help red blood cells in the transportation of oxygen and carbon dioxide.

  2. To clot the blood at the time of injuries.

  3. To accelerate the production of red blood cells in the bone marrow.

  4. To defend the body against infections.

Show answer
Correct Option: D
Explanation:

White blood cells(WBCs) are the body's defense systems. They attack foreign bodies that invaded the blood or any part of the body. Foreign bodies like the bacteria, viruses and the fungi rendering them less invasive and even destroys them. They are cells involved in the “inflammatory” response. This response develops when tissue is damaged or invaded by microbes. Neutrophils specialize is killing bacteria. Eosinophils kill parasites. Monocytes control inflammation by releasing cytokines. Lymphocytes recognize and destroy cells infected by viruses or transplanted foreign cells. 

So, the correct option is 'To defend the body against infections'

Myoglobin is found in

evs our body- its internal organ system leucocytes body fluids and immune responses respiratory and circulatory system

  1. White fibres

  2. Red fibres

  3. Can be traced in both

  4. Cardiac muscles only

Show answer
Correct Option: B
Explanation:

Myoglobin is found in red fibres.

Myoglobin contains a heme (prosthetic) group which is responsible for its main function (carrying of oxygen molecules to muscle tissues). Myoglobin can exist in the oxygen free form, deoxymyoglobin, or in a form in which the oxygen molecule is bound, called oxymyoglobin.
Myoglobin is an iron and oxygen-binding protein found in the muscle tissue of vertebrates in general and in almost all mammals. It is related to hemoglobin, which is the iron and oxygen-binding protein in blood, specifically in the red blood cells. In humans, myoglobin is only found in the bloodstream after muscle injury
So, the correct answer is 'Red fibres'

The different types of the blood vessels seen in the body are

evs our body- its internal organ system leucocytes body fluids and immune responses respiratory and circulatory system

  1. Three

  2. Two

  3. Four

  4. Five

Show answer
Correct Option: A
Explanation:
There are three different types of blood vessels in the body namely arteries, veins and capillaries. Arteries are the blood vessels which carry blood away from the heart while veins carry blood towards the heart. Capillaries are the smallest blood vessels which connect arteries and veins. 
Therefore, the correct answer is option A.

Which is the correct sequence of arrangement of types of WBC in decreasing order in terms of number per ${mm}^{3}$ of human blood?

evs our body- its internal organ system leucocytes body fluids and immune responses respiratory and circulatory system

  1. Eosinophils --> Basophils --> Neutrophils

  2. Basophils --> Eosinophils --> Neutrophils

  3. Neutrophils --> Eosinophils --> Basophils

  4. Eosinophils --> Neutrophils --> Basophils

Show answer
Correct Option: C
Explanation:

Percentage distribution of leukocyte are as follows:

Neutrophils- 60 - 70%
Lymphocytes- 20 - 30%
Monocytes- 2 - 8%
Eosinophils- 1 - 4%
Basophils- 0.5 - 1%
Thus, the correct answer is option C.

Which blood cells of mammals are concerned with immunity?

evs our body- its internal organ system leucocytes body fluids and immune responses respiratory and circulatory system

  1. Young Erythrocytes

  2. Leucocytes

  3. Thrombocytes

  4. Matured Erythrocytes

Show answer
Correct Option: B
Explanation:

Leucocytes or the white blood cells are concerned with immunity. They perform phagocytosis, antigen-presenting, the release of antibodies, release of cytokines, opsonization etc. to keep the immunity of the body against the pathogens. Erythrocytes or the red blood cells are responsible for the transportation of oxygen. Thrombocytes or the platelets are responsible for blood clotting.

Hence, the correct answer is 'Leucocytes'.

WBC is called as true cell because of

evs our body- its internal organ system leucocytes body fluids and immune responses respiratory and circulatory system

  1. Presence of nucleus

  2. Phagocytosis

  3. Polymorphism

  4. None of the above

Show answer
Correct Option: A
Explanation:

The components of blood consists of red blood cells, white blood cells and platelets. Of these, only white blood cells are true cells or complete cells as they have a nucleus, organelles and other cell structures and processes such as expressing proteins.
Thus, the correct answer is option (A).