Heart & Breathing
What is heart rate?
The number of times the heart beats per minute.
The number of times the heart beats per minute.
What cools the body during exercise?
sweat
What is fatigue?
Extreme tiredness caused by exercise.
What is nausea?
A feeling of sickness or wanting to vomit.
What is recovery time?
The time needed for the body to return to resting levels after exercise.
Why does heart rate increase during exercise?
.
To deliver more oxygen to the muscles
What process allows sweat to cool the body?
evaporation
What substance can build up in muscles during sprinting?
Lactic acid.
Why can exercise cause nausea?
Blood moves away from the stomach to the muscles.
Which hormone increases heart rate during exercise?
Adrenaline.
What happens to breathing rate during exercise?
It increases to bring in more oxygen and remove carbon dioxide.
Why does skin become red during exercise?
Blood vessels widen and more blood flows near the skin.
Why can muscles feel like they are burning during exercise?
Because of lactic acid buildup.
What happens to blood pressure after intense exercise that may cause dizziness?
It can drop.
Who usually recovers faster after exercise: fit or unfit people?
fit people
Which gas do muscles need more of during exercise?
oxygen
Why is sweating so effective at cooling the body down?
Because water transfers heat very effectively, so when sweat evaporates it removes heat energy from the body.
What happens to glucose during long exercise sessions?
The body can run out of glucose for energy.
Name one way to reduce light-headedness after exercise.
Deep breathing, lying down, or raising the legs.
Why do fit people recover faster?
Their cardiovascular system works more efficiently
Explain why breathing remains fast after exercise.
The body still needs extra oxygen and must remove excess carbon dioxide while recovering.
Explain how red skin helps regulate body temperature.
More blood flows near the skin so heat can escape from the body.
Compare one cause of fatigue in sprinting and one cause in endurance exercise.
Sprinting fatigue is caused by lactic acid buildup, while endurance fatigue is caused by glucose depletion.
Explain why stopping suddenly after exercise may cause dizziness.
Blood vessels stay widened while heart rate slows, causing blood pressure to drop.
Explain how adrenaline helps the body during exercise.
Adrenaline prepares the body for activity by increasing heart rate and energy supply.