Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
In mammals, which blood vessel would normally carry largest amount of urea?
(b) Urea is synthesized in liver. So, maximum amount of urea is present in hepatic vein and minimum in renal vein
Blood pressure in the pulmonary artery is
(b) Blood pressure in different blood vessels:
Artery>Arteriole>Capillary>Venule>Vein (vena cava)
The pulmonary arteries have thicker smooth muscle and connective tissue than the pulmonary veins to accommodate the higher pressure and speed of blood.
Doctors use a stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when
(c) In healthy adults, there are two normal heart sounds often described as lubb and dup. These are the first heart sound and second heart sound produced by the closing of the AV valves and semilunar valves respectively.
Blood pressure in the mammalian aorta is maximum during
(c)
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’.
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