Practice free Body Fluids and Circulation (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
How do parasympathetic neural signals affect the working of the heart?
(a) Parasympathetic neural signal reduces both heart rate and cardiac output, through the post ganglionic fibres. These fibres are very short, and are cholinergic in nature.
A certain road accident patient with unknown blood group needs immediate blood transfusion. His one doctor friend at once offers his blood. What was the blood group of the donor?
Blood group is tested by two types of sera i.e., anti-A (antibody-A) and anti-B (antibody-B). Persons with blood group O possess both antibodies in their plasma but have no antigens in their RBCs. So, RBCs of blood group 'O' do not show clumping in any of the two sera. That's why, persons with blood group 'O' are called universal donor and they can donate blood to a person with any type of blood group.
A patient brought to a hospital with myocardial infarction is normally immediately given
(b) Streptokinase (SK), a protein secreted by several species of streptococci can bind and activate human plasminogen. It is used as an effective and inexpensive thrombolysis medication in some cases of myocardial infarction and pulmonary embolism.
Arteries are best defined as the vessels which
(a) Arteries are blood vessels that carry blood away from the heart towards different organs. They generally contain oxygenated blood (except pulmonary artery which contains deoxygenated blood). The blood flows in an artery under alternate increased pressure with jerks.
Which one of the following statements is correct regarding blood pressure?
Hypertension is the term for blood pressure that is higher than normal (120/80). In this measurement, 120 mm Hg (millimeter of mercury pressure) is the systolic or pumping, pressure and 80 mm hg is the diastolic, or resting pressure. If repeated checks of blood pressure 190/100 mm Hg) of an individual is 140/90 (140 over 90) or higher, it shows hydpertension. High blood pressure (190/100 mm Hg) leads to heart diseases and also affects vital organs like brain and kidney.
A person with unknown blood group under ABO system, has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend who has a valid cetificate of his own blood type, offers for blood donation without delay. What would have been the type of blood group of the donor friend?
Group ‘O’ blood can be donated to persons with any other blood group and hence ‘O’ group individuals are called ‘universal donors’.
'Bundle of His' is a part of which one of the following organs in humans?
(a) 'Bundle of His' is a part of heart in humans. The bundle of His is an important part of the electrical conduction system of the heart, as it transmits impulses from the atrioventricular node, located at the inferior end of the interatrial septum, to the ventricles of the heart.
Examination of blood of a person suspected of having anaemia, shows large, immature, nucleated erythrocytes without haemoglobin. Supplementing his diet with which of the following, is likely to alleviate his symptoms?
Deficiency of vitamin B12(cobalamine) and folate can result in megaloblastic anaemia. This type of anaemina may be accompanied with ineffective erythropoiesis. Neurological abnormalities are peculiar symptom of the disease. The vitamins are intertwined biochemically so that the final common pathway that impairs DNA synthesis in hematopoietic cells.
Folic acid (Vit B9) is essential for formation of RBCs and deficiency causes megablastic anaemia, abnormal immature RBCs by bone marrow.
Cyanocobalamin (Vit B12) is essential for RBCs production, DNA synthesis, proper functioning of neurological system its deficiency causes pernicious anaemia.
In the foetus, the ductus arteriosus connects the
(b) Ductus arteriosus is a channel of communication between the main pulmonary artery and the aorta of the foetus that allows much of the blood from the right ventricle to bypass the foetus fluid filled lungs. During foetal development, this protects the lungs from being overworked and allow the right ventricle to strengthen.
Which of the following is known as Christmas factor?
(d) Christmas factor is the plasma thromboplastin component i.e., thromboplastin activator present in blood plasma. Factor IX is synthesized in liver with the help of vitamin K. It causes congenital disorder, haemophilia B (also called christmas disease). This disease is sex linked recessive and determined by distinct gene from the sequence involved in the commoner haemophilia A in which deficiency of factor VIII occurs.
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