MCQ
How much blood is pumped by the human heart in a minute?
- A$4$ litres.
- ✓$5$ litres.
- C$6$ litres.
- D$7$ litres.
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$(a)$ Contraction of diaphragm
$(b)$ Contraction of external inter-costal muscles
$(c)$ Pulmonary volume decreases
$(d)$ Intra pulmonary pressure increases