Question

State whether the following statements are
true or false. If false, rewrite the correct
form of statements.
1. Human body has 4 to 6 litres of blood.
2. Heart muscles are cardiac muscles.
3. Impure blood from different parts of the body
returns to the left auricle.
4. Valves in the veins open on both sides.
5. Heart is enclosed in a thin pericardium formed
of single pericardial membrane.
6. In a normal healthy person, the heart beats
68-72 times per minute.​

Answer 1

Answer:

1.)false,human body has 4.5 to 5.5 litres of blood.

2.)True

3.)false,The right auricle receives blood (which is impure) from the body and pumps the same to the lungs for purification .

4.)false,Valve open in one direction like a trapdoor .

5.)True

6.)60 to 100 beats per minute