Biology - Heart Rate/Blood Pressure

Hi, can someone help me with these questions?

Why is it that athletes have to exercise harder/longer to get max heart rate than people that aren't physically fit?

Why does smoking cause rise in blood pressure? (Does it have to do with less oxygen getting throughout the body??)

And Why is high blood pressure dangerous ?

Thank you in advance!

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  1. Thank you for using the Jiskha Homework Help Forum.

    1. Athletes have a lower maxium heart rate. A stronger heart pumps more b lood with each beat, so stronger hearts don't have to beat as often.

    2. Both blood pressure and heart rate increase during smoking. These effects are associated specifically with nicotine. There is an increase in cardiac output and in total peripheral vascular resistance.

    3. High blood pressure can lead to stroke, fluid making it difficult to catch a breath, and ren al failure.

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  2. why do we mesure our blood pressure in Hg

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