Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
The heart is a muscular pump that circulates blood through the body to deliver (oxygen) and nutrients to cells.
During exercise, muscles require more energy, which is produced through the process of cellular respiration.
To meet the increased energy demand, the heart must beat faster to deliver more and remove waste products like (carbon dioxide).
Pulse rate is a measure of how many times the heart beats in one minute, typically expressed as beats per minute (bpm).
Recovery time is the duration it takes for the heart rate to return to its resting state after physical activity. A shorter recovery time often indicates better cardiovascular fitness.
The resting heart rate for an average 10-year-old is typically between and bpm.
📐Formulae
💡Examples
Problem 1:
Before PE class, Leo measures his pulse and counts beats in seconds. After running, he counts beats in seconds. Calculate his resting heart rate and his heart rate after exercise in bpm.
Solution:
Resting: bpm. After exercise: bpm.
Explanation:
To find the beats per minute (bpm) from a -second count, we multiply by because (which is minute).
Problem 2:
Why does the body produce more during a sprint than while sitting down?
Solution:
During a sprint, muscles perform more respiration to create energy, leading to higher production.
Explanation:
Respiration uses and glucose to create energy, releasing as a byproduct. Faster movement requires more energy, thus increasing the rate of this chemical reaction.