Blood Circulation | Blood Circulation related Short Question and Answers. - USA History 

 Very Short Questions Answers

1) What is the diapedesis ? 

Ans :- Leucocytes perform amoeboid movement. Due to this kind of movement they can squeeze out of blood capillaries. This is called as diapedesis.

2) Name the cells which produce thrombocytes. ? 

Ans :- Megakaryocytes produce thrombocytes.

3) What is the cardiac cycle ?

Ans :- The events associated with one heart beat, i.e. atrial systole, ventricular systole followed by joint diastole together form one cardiac cycle.

4) What is the angina pectoris ?

Ans :- Angina pectoris is the pain in the chest caused due to the redcuction in blood supply to cardiac muscle. The narrowed and hardened coronary arteries are the main cause for angina pectoris.

5) Which structure in the heart is called pacemaker ?

Ans :- Sinuatrial node in the heart wall is called a pacemaker.

6) What  did william Harvey discover ? 

Ans :- William Harvey discovered closed circulatory system.

7) What is circulatory system ?

Ans :- The system in which blood is circulated throughout the body is called circulatory system.

8) What is haematology ?

Ans :- Haematology is the study of blood.

9) What is double circulation ?

Ans :- The movement of blood twice through the heart during one circulation cycle is called double circulation.

Body -----> Heart -----> lungs -----> heart -----> body is the course of double circulation.

10) What is the pH of blood ? 

Ans :- The pH of blood is 7.4.

11) How much blood is present in the human body and what percentage of body weight does it form ?

Ans :- In average adult human body there is about 5 liters of blood that constitutes about 8% of body weight.

12) What is the percentage of plasma in the blood and how much water does it contain ?

Ans :- There is 55% of plasma in the blood and it contains 90 to 92% water.

13) Whatis the average life span of RBC's ? 

Ans :- RBCs have a life span of about 120 days.

14) What is normal RBC count and total WBC count ?

Ans :- Average RBC count in adult human is 5.1 to 5.8 million per cubic mm and average total WBC count in adult human is 5000 to 9000 per cubic mm.

15) What is erythropoiesis ?

Ans :- The process of formation of Red Blood Cells is called erythropoiesis.

16) What is increase in the RBC number called ?

Ans :- The increase in the number of RBCs is called polycythemia.

17) Name the process of formation of white blood cells ? 

Ans :- Leucopoiesis.

18) What is leucopenia and erythrocytopenia ? 

Ans :- The decrease in the number of white blood cells is called leucopenia whereas decrease in the number of red blood cells is called erythrocytopenia.

19) What is the difference between anaemia and leukaemia ?

Ans :- Anaemia is disorder caused due to the deficiency of haemoglobin while leukaemia is blood cancer in which there is abnormal increase in the number of white blood cells.

20) Which WBC is called scavenger ? Why? 

Ans :- Monocyte is called scavenger as it changes into macrophage and engulfs the infection causing the microorganisms and removes cell debris.

21) Name the space in which human heart is located ?

Ans :- Mediastinum is the space in which human heart is located.

22) Name the layers of peritoneum that surrounds the heart sequentially from outside to inside. ? 

Ans :- Fiborus pericardium, visceral layer of serous pericardium called epicardium and parietal layer of serous pericardium.

23) What  are the three layers of heart wall ?

Ans :- Outer epicardium made of mesothelium, middle myocardium made of muscle fibres and inner endocardium made of endothelium are the three layers of  heart wall.

24) Name the connection between the pulmonary trunk and systemic aorta, what does it represent ? 

Ans :- Ligamentum arteriosum that represents remnant of ductus arteriosus of foetus.

25) Where are Eustachian valve and Thebesian valve located ?

Ans :- Eustachian valve is present at the opening of inferior vena cava while Thebesian valve is present near the opening of coronary sinus.