The specialised patch of modified heart muscles from where contraction initiates is/are :
In the systemic circulation, the blood vessel that carries blood from the intestine to the liver is named:
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Read the following and choose the correct option:
(i) Blood vessels include arteries and veins. Arteries carry blood from the heart to body parts and veins bring back blood from the body parts to the heart.
(ii) The blood vessel which carries blood from the heart to the lungs is a pulmonary artery and it carries oxygenated blood.
The given figure shows schematic plan of blood circulation in humans with labels A to D. Identify the labels and select the correct option.
Read the following and choose the correct option:
(i) The instrument used for recording the heart’s electrical events is named electrocardiograph.
(ii) In any ECG the part of the baseline between any two deflections is called interval.
(iii) Abnormality in the working of heart changes wave pattern of ECG.
In which organisms is an open circulatory system typically found?
Which type of heart structure is present in amphibians and reptiles, except crocodiles?
Where is the human heart located in the body?
Which structure separates the right and left atria of the heart?
Where does the atrioventricular bundle (AV bundle) emerge from after passing through the atrioventricular septa?
What distinguishes the circulatory pathways in birds and mammals from those in fishes and amphibians?
What is the primary role of thrombin in the blood coagulation process?
Assertion (A): Coronary artery disease is primarily caused by a buildup of calcium, fat, cholesterol, and fibrous tissues in the arteries.
Reason (R): This accumulation leads to the narrowing of the arterial lumen, which reduces blood flow to the heart muscle.
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