The path which the blood flows through during pulmonary circulation is:

1. RA → RV → Pulmonary arteries → Lungs → Pulmonary veins → LA
2. LA → LV → Pulmonary veins → Lungs → Pulmonary arteries → RA
3. LA → LV → Aorta → Body → Vena Cavae → RA
4. RA → RV → Vena Cavae → Body → Aorta → LA

Karl Landsteiner classified human blood into four categories on the basis of proteins (antigens) found on the surface of the RBCs. Compatibility of blood groups must be checked during blood transfusion. Which of the following statements are incorrect ?

P. Blood group 'AB' is the universal donor as it does not contain any antibodies.

Q. Blood group 'AB' is the universal recipient as it contains both the antigens 'A' and 'B'.

R. Blood group 'O' is the universal recipient as it does not contain any antigens.

1. Only R
2. Only P and R
3. Only P and Q
4. Only Q and R

Geetika's mother has certain ailments of the heart. She is often very stressed and has anxiety. Sometimes, she experiences her heart beating too hard or too fast and occasionally even skipping a beat. Which of the following heart-related conditions explains her problem ?

1. Hypertension
2. Heart attack
3. Palpitations
4. Cardiac arrest

Assertion (A): Veins carry blood away from the heart to different organs of the body.

Reason (R): Veins supply oxygenated blood to most organs of the body except lungs because lungs already contain enough amount of oxygen.

1. Both A and R are true.
2. Both A and R are false.
3. A is true and R is false.
4. A is false and R is true.