AIIMS Biology Body Fluids And Circulation Class 11 Questions

Which of the following has highest pH?

Select the option having all the correct matches. Structure Percentage Function

Ventricular diastole occurs due to a/an

Which of the following is an incorrect statement?

The opening between the right atrium and the right ventricle is guarded by the valve named

Assertion : Blood group 'O' have anti-A & anti-B antibodies. Reason : It does not have any antigens.

Assertion : S.A. node induces excitatory impulses in heart. Reason : S.A. node is self excitatory.

Which one is correct regarding electrocardiograph (ECG)?

The component of blood which prevents its coagulation in the blood vessels is

Thickening of arteries due to cholesterol deposition is

Assertion (A) : Blood coagulate in uninjured blood vessels. Reason (R) : Uninjured blood vessels release an anticoagulant heparin.

Assertion (A) : Smaller the organism higher is the rate of metabolism per gram weight. Reason (R) : The heart rate of a six month old baby is much lower than that of an old person.

In which one of the following pairs the two items mean one and the same thing?

An artificial pacemaker is implanted subcutaneously and connected to the heart in patients

The crystal of lead zirconate is a key component of :

Which one of the following is a matching pair?

Assertion : Mast cells in the human body release excessive amounts of inflammatory chemicals which cause allergic reactions. Reason : Allergens in the environment on reaching human body stimulate mast cells in certain individuals.

Assertion : WBCs accumulate at the site of wounds by diapedesis. Reason : It is the squeezing of leucocytes from the endothelium.

Assertion : Histamine is involved in allergic and inflammatory reactions. Reason : Histamine is a vasodilator.

All veins carries deoxygenated blood except:-

Thickening of arteries due to cholesterol deposition is

Assertion: Person with blood group AB can take blood from any other person. Reason: Blood group incompatibility is due to antigen-antibody reaction. Blood group AB has no antibody and thus the antigen of the other group is not affected.