THE MAMMALIAN HEART (EXERCISE)

Question 1

What happens during exercise?

Answer 1

The muscles are contracting more and are in need of more energy=
so need to respire more=and so need (more 02 and glucose) and produce more waste (C02)

Question 2

What do the body do to respond to this demand of 02 and glucose?

Answer 2

The heart contracts more increasing the heart rate(increasing the BPM)

Question 3

What else does the body do to respond to this demand of 02 and glucose?

Answer 3

The heart contracts more FORCEFULLYincreasing the volume of blood pumped in each beat(stock volume increases)

Question 4

How can changes in the heart rate be measured?

Answer 4

By measuring the pulse rate (beats per minute) at the wrist/side of the neck?

Question 5

What blood vessel can we feel a pulse?

Answer 5

Arteries .carry blood at high pressure away from the heart.

The blood being pushed along by each heart beat is the pulse

Question 6

How is the HB after you stop doing exercise?

Answer 6

It turns to its normal resting rate after a few minutes

Question 7

Why does the HB return to normal after exersise?

Answer 7

To continue to supply o2 to the muscle cells to repay the oxygen debt built up during exercise if the muscles respired anaerobically and produced lactic acid

Question 8

Why is oxygen need after exercise?

Answer 8

to combine with the lactic acid (a toxic substance) and break it down into carbon dioxide and water