Blood pressure and heart beat is regulated by `:-`

Rate of heart beat is regulated by

Rate of heart beat is regulated by

Tobacco contains nicotine which stimulates -------X------- to release ----------Y--------- into blood which increases blood pressure and rate of heart beat. Select t correct option for X and Y.

Tobacco contains nicotine which stimulates -------X------- to release ----------Y--------- into blood which increases blood pressure and rate of heart beat. Select t correct option for X and Y.

In man regulation of respiration and heart beat is maintained by

Blood pressure increases and heart rate decreases in response to

What do you mean by blood pressure and heart attack? Explain.