Answer:

1.your pulse is your hearth rate,or the number of times your heart beat in one minute.

2.when you exercising ,your muscle need extra oxygen —three times as much as resting muscle.this means that your heart starts pumping faster.

3.it causes to pump to blood into the circulation more efficiently as a result of more fprceful and effecient myocardials contractions.

Answer:

1. Each heartbeat arises from specialized muscle cells called myocytes. When these cells need more oxygen, as during exercise, the brain sends messages to the heart, causing myocytes to make stronger, more frequent pulses. Everyone experiences sudden, temporary changes in their heart rate.

2. Yes, the heart beats on normal rate before jumping because it has enough air to breath and the exchanges of gases are normal. When we jump, we exert energy that makes up more active and that causes the heart to pump faster.

3. Improves the muscles' ability to pull oxygen out of the blood, reducing the need for the heart to pump more blood to the muscles. Reduces stress hormones that can put an extra burden on the heart. Works like a beta blocker to slow the heart rate and lower blood pressure.

Explanation:

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