How can you explain the following ?
(i) Auricles have thinner walls than ventricles.
(ii) Blood flows under pressure in the arteries.
(iii) Heart has striped muscles unlike other viscera.
(iv) There is a slight gap between auricular systole and ventricular systole.

Identify the correct sequence of the cardiac cycle. (i) Blood through the pulmonary vein and vena cava enters in left and right atria respectively. (ii) AVN generates action potential for the ventricles. (iii) SAN bring about atrial systole . (iv) Ventricular systole pushes blood away from the heart .

Identify the correct sequence of the cardiac cycle. (i) Blood through the pulmonary vein and vena cava enters in left and right atria respectively. (ii) AVN generates action potential for the ventricles. (iii) SAN bring about atrial systole . (iv) Ventricular systole pushes blood away from the heart .

Go through the following statements (i) As smaller animals have the higher metabolic rate, their heart rate is higher than that of the larger animals (ii) Systoles of artria and ventricles never overlap while their diastoles always partly overlap. (iii) Cardiac cycle time is inversely proportional to the heart rate Which of these are correct ?

Go through the following statements (i) As smaller animals have the higher metabolic rate, their heart rate is higher than that of the larger animals (ii) Systoles of artria and ventricles never overlap while their diastoles always partly overlap. (iii) Cardiac cycle time is inversely proportional to the heart rate Which of these are correct ?

Go through the following statements (i) As smaller animals have the higher metabolic rate, their heart rate is higher than that of the larger animals (ii) Systoles of artria and ventricles never overlap while their diastoles always partly overlap. (iii) Cardiac cycle time is inversely proportional to the heart rate Which of these are correct ?

Consider the following four statement (i) - (iv) and select the correct option. (i) SA node is natural pacemaker of heart (ii) Human heart has inter-auricular foramen (iii) Right atrioventricular valve is a semilunar value (iv) Normal systolic and diastolic pressure of human is 120 and 60 mm Hg respectively.

Consider the following four statement (i) - (iv) and select the correct option. (i) SA node is natural pacemaker of heart (ii) Human heart has inter-auricular foramen (iii) Right atrioventricular valve is a semilunar value (iv) Normal systolic and diastolic pressure of human is 120 and 60 mm Hg respectively.

Read the following statements carefully (i) In fishes, the heart pumps out deoxygenated blood which is oxygenated by the gills and supplied to the body part from where deoxygenated blood is returned to the heart (ii) The openings of the right and the left ventricles into pulmonary artery and aorta respectively are provided with the mitral valves (iii) The nodal musculature has the ability to generate action potential without any external stimuli, i,e., it is autoexcitable (iv) The T-wave of ECG represent depolarisation of the ventricles. Which of the above two statements are incorrect ?