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Given below are four statements (a-d) regarding human blood circulatory system
(1)Arteries are thick-walled and have narrow lumen as compared to veins
(2)Angina is acute chest pain when the blood circulation to the brain is reduced
(3)Persons with blood group AB can donate blood to any person with any blood group under ABO system
(4)Calcium ions play a very important role in blood clotting
Which two of the above statements are correct?
Which one engulfs pathogens rapidly?
Neutrophils are a type of leucocyte (WBCs) that can take all types of stain (Acid-Basic-Neutral). It is most abundant (60-70% of total WBCs) and most active type of WBCs i.e. they are the most actively phagocytic in nature.
Breakdown product of haemoglobin is
Breakdown products of haemoglobin are haem & Globin protein which is then converted into yellowish substance bilirubin which is extracted by the liver cells from the blood & stored in the form of bile in gall bladder.
Which of the following organs can be called as a sort of “blood bank” ?
Bundle of His is a network of
The atrioventricular bundle (AV bundle), on entering the ventricles splits into right and left branches. These branches then enter the heart muscles. They branch extensively and are called Purkinje fibres. They conduct the cardiac impulse to the ventricular wall.
The pacemaker of the human heart is
Pulmonary artery carries
The correct route through which pulse-making impulse travels in the heart is
The pulse making impulse travels in the heart in the order of SA node → AV node → bundle of His → Purkinje fibres → heart muscles.
Arteries carry oxygenated blood except
Pulmonary artery carries the blood from the right ventricle of the heart to the lungs for oxygenation so it carries deoxygenated blood.
A four chambered heart is not found in
Four chambered heart is found only in mammals and birds except some reptiles such as crocodiles, gavialis and alligators.