State whether True or False. If false write the correct statement II

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1. Initiation and stimulation of heart beat take place by nerves.

The statement is

2. All veins carry deoxygenated blood.

The statement is

3. WBC defend the body from bacterial and viral infections.

The statement is

4. The closure of the mitral and tricuspid valves at the start of the ventricular systole produces the first sound ‘LUBB’.

The statement is

LUBB is low pitched, produced by the closure of bicuspid and tricuspid valves after the beginning of ventricular systole
LUBB is produced during the closure of semilunar valves

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8. State whether True or False. If false write the correct statement II