Tag: basics of blood and heart

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Multiple choice evs transportation in animal and plants blood in humans circulatory system - blood basics of blood and heart

Which of the following cells gets activated during bleeding?

  1. RBC

  2. WBC

  3. Platelets

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
If one of your blood vessels gets damaged(bleeding), it sends out signals to the platelets. The platelets then rush to the site of damage. they form a plug (clot) to fix the damage. The process of spreading across the surface of a damaged blood vessel to stop bleeding is called adhesion. This is because when platelets get to the site of the injury, they grow sticky tentacles that help them stick (adhere) to one another. They also send out chemical signals to attract more platelets. The additional platelets pile onto the clot in a process called aggregation.

So, the correct answer is 'Platelets'.
Multiple choice evs transportation in animal and plants blood in humans circulatory system - blood basics of blood and heart

Platelets helps in 

  1. Transport of gases

  2. Clotting

  3. Fight against disease

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
When an injury or a trauma occurs platelets are exposed to air this phenomenon stimulates the platelets to start the clotting process. These platelets react with the protein called fibrinogen with the help of vitamin k and calcium. Fibrinogen forms a mesh of tiny threads that collects red blood cells, which plug the open blood vessels as it dries. This is called a clot. Hence platelets help in clotting.
So, the correct answer is 'Clotting'.
Multiple choice evs transportation in animal and plants blood in humans circulatory system - blood basics of blood and heart

Loss of haemoglobin can be controlled by

  1. Platelets

  2. RBC

  3. WBC

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

Platelets are cell fragments produced from megakaryocytes (special cells in the bone marrow). They are also called as thrombocytes. An injury or a trauma stimulates the platelets in the blood to release certain factors which activate the mechanism of coagulation or blood clotting. They also change their shape from round to spiny and stick to the broken vessel wall and each other and forms net-like structure during bleeding. This prevents the loss of hemoglobin through bleeding.

So, the correct answer is 'Platelets'.

Multiple choice evs transportation in living organisms blood in humans circulatory system - blood basics of blood and heart

Critical count of Platelete is _______________

  1. $4\times 10^4 /mm^3$

  2. $1 \ lakh /mm^3$

  3. $2   lakh /mm^3$

  4. $4   lakh /mm^3$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Platelet count is the number of platelets in the blood. The normal platelet count ranges from 2- 5 lakh cells/mm$^3$. In disease conditions like dengue, the platelet count is decreased below the average value. This condition is called thrombocytopenia. If platelet count drops below 1 lakh /mm$^3$, it is considered as critical platelet count it denotes that person is at high risk of bleeding.
So, the correct answer is 'Option B'.
Multiple choice evs transportation in living organisms blood in humans circulatory system - blood basics of blood and heart

During heat shock to the bacterium , the temperature used for giving thermal shock is:

  1. $82^oC$

  2. $109^oC$

  3. Liquid nitrogen

  4. $42^oC$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Heat Shock is given to bacteria for transformation that alters the membrane fluidity. The increase in temperature creates pores in the bacterial plasma membrane and allow plasmid DNA to enter the bacterial DNA. For the heat shock, the DNA-bacteria mixture is put into a 42C to 37C water bath. 

Multiple choice evs transportation in living organisms blood in humans circulatory system - blood basics of blood and heart

TLC of human blood is about?

  1. $5000 - 6000$ per ml of blood

  2. $5000 - 11000$ per ml of blood

  3. $5000 - 11000$ per cubic mm of blood

  4. $2000 - 6000$ per cubic mm of blood
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
TLC or the total leukocyte count is calculated by a laboratory test. It calculates the number of cells present in a fixed volume of blood (or area). The standard TLC of blood in humans usually ranges from 4,000 and 11,000 cells in every microliter of blood. This value can vary from one race to another.
So, the correct answer is '5000−11000 per ml of blood'.