✓✗Which of the following vessels carries deoxygenated blood?

✓✗Which fluid surrounds the body cells directly?

✓✗Which of the following events occur during joint diastole?
A. All four chambers are relaxed.
B. The tricuspid and bicuspid valves are open.
C. The semilunar valves are open.
D. Blood from the veins flows into the ventricles through the atria.
Choose the correct answer from the options given below.

✓✗The circulation that provides nutrients, O₂ and other essential substances to the tissues is the

✓✗Which one of the following animals has two separate circulatory pathways?

✓✗Arrange the following in decreasing order of their number in human blood.

✓✗How many of the following persons can safely donate blood to a person of group A?
Group A donor, group B donor, group AB donor, group O donor

✓✗The first heart sound is heard

✓✗If the semilunar valves of the aorta become leaky, blood will flow back from the

✓✗Which of the following pairs of WBCs together form about 85 per cent of the total WBCs?

✓✗The machine used to obtain an ECG is the

✓✗Which one of the following is correct?

✓✗Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The left ventricle of heart has a thinner wall than that of the right ventricle.
Reason (R): The left ventricle needs to pump blood to nearby lungs only.
In the light of the above statements, choose the correct answer from the options given below.

✓✗The minute fibres throughout the ventricular musculature arising from the right and left bundles are called

✓✗The SA node is located in the