Tag: blood circulatory system of human

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Questions Related to blood circulatory system of human

Multiple choice bio-chemistry blood circulatory system of human role of blood in transport function of blood body fluid

Heart is a ................ pumping organ. 

  1. Blood

  2. Lymph

  3. Plasma

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the body, the heart is muscular organ made up of cardiac muscles which has four chambers. The right side of the heart receives deoxygenated blood from the veins and pumps it to the lungs that oxygenates it.The left side of the heart receives oxygenated blood from the lungs and pumps it through the arteries to all body. Thus the correct answer is option A.

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

Platelets are

  1. Source of growth factors

  2. Involved in hemostasis

  3. Lead to blood clots

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Platelets are parts of the blood that help the blood clot. They are smaller than red or white blood cells. Platelets are a natural source of growth factors. They circulate in the blood of mammals and are involved in hemostasis, leading to the formation of blood clots. Platelets release thread-like fibers to form these clots. 

Therefore, the correct answer is option D.

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

The process of blood clotting does not require

  1. Sodium ions

  2. Calcium ions

  3. Prothrombin

  4. Vitamin K

  5. Platelets
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Blood clotting is the process by which blood changes from liquid to gel and stop bleeding. When the blood vessels get injured, platelets in blood produces prothrombin in the presence of vitamin K. The prothrombin then converts into the thrombin (active form) in the presence of thrombokinase and calcium ions. This thrombin then converts fibrinogen (inactive) into the fibrin (active). Fibrin thread then plugs the damaged part and appear like a clot. Thus, the correct answer is option A.

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

Name of cells which help in clotting of blood in mammals ____________.

  1. Platelets

  2. Thrombocytes

  3. Lymphocytes

  4. Monocytes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Platelet, also called thrombocyte, colourless, nonnucleated blood component that is important in the formation of blood clots (coagulation). Platelets are found only in the blood of mammals.


So, the correct answer is 'Platelets'.

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

Blood platelets occur in the blood of ____________.

  1. Birds

  2. Mammals

  3. Reptiles

  4. Amphibians
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Only mammals have platelets, tiny cells without nuclei that are responsible for plugging the leaks in the blood vessels. Other animals use more conventional systems of hemostasis. Some marine invertebrates have a single type of blood cell, responsible for hemostasis, but also for other types of defences. Non-mammalian vertebrates have specialized nucleated thrombocytes to do the job.


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 cells

  2. Non-nucleated cells

  3. Non-nucleated cell fragments

  4. Nucleated cell fragments
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Platelets are small, non-nucleated cells that are derived from megakaryocytes in the bone marrow. Platelets circulate in the blood, sense damage to a blood vessel and accumulate at these sites, where they initiate blood clotting. They are fragments of cytoplasm that are derived from the megakaryocytes of the bone marrow.


So, the correct answer is 'Non-nucleated cell fragments'.

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

Instead of platelets, the non-mammals possess clotting factor in.

  1. Nucleated cells called thrombocytes

  2. RBC

  3. WBC

  4. Plasma
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Only mammals have Platelets. Non-mammals possess thrombocytes which are nucleated cells which have been shown to have a haemostatic function paralleling that of mammalian platelets.


So, the correct answer is 'Nucleated cells called thrombocytes'.

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

Megakaryocytes.

  1. Produce leucocytes

  2. Form blood platelets

  3. Are called bone cells

  4. Are carriers of oxygen
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A megakaryocyte is a large bone marrow cell with a lobated nucleus responsible for the production of blood thrombocytes (platelets), which are necessary for normal blood clotting.


So, the correct answer is 'Form blood platelets'.

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

The life span of thrombocytes is

  1. 4 to 5 weeks

  2. 3 to 4 weeks

  3. 3 to 7 days

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The average life span of circulating platelets is 8 to 9 days. Life span of individual 3 to 7 days thrombocytes is controlled by the internal apoptotic regulating pathway, which has a Bcl-xL timer. Old thrombocytes are destroyed by phagocytosis in the spleen and liver. So, the correct answer is "3 to 7 days.'
Multiple choice biology blood circulatory system of human blood clotting platelets and their function defence against infectious disease

$1$ li. of oxygenated blood can deliver how much amount of $O _2$ to the tissue under normal conditions.

  1. $4$ ml
  2. $50$ ml
  3. $20$ ml
  4. $159$ ml
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Under normal physiological conditions, every 100 ml of oxygenated blood delivers approximately 5 ml of oxygen to the tissues. Therefore, 1 liter (1000 ml) of oxygenated blood delivers about 50 ml of oxygen.