21.
How many chambers does the heart have?
A
Six
B
Five
C
Four
D
Three
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How many chambers does the heart have?
Six
Five
Four
Three
Circulation and regulation of the heartbeat during high blood pressure is controlled by
Vasoconstrictor and cardio-stimulatory centre
Vasoconstrictor and vasodialtor centres
cardio-inhibitory and vasodialator centre
cardio-inhibitory and vasoconstrictor centre