What is the heart muscle?

1. The Muscular Heart
7th Grade, Physical Education – Ms. Cavallo

2. What is the Heart?
- The most important muscle in your body.
- Purpose is to pump blood throughout the entire
body!
- Carries oxygenated blood to organs and muscles,
and carries carbon dioxide to the lungs to be
exhaled through the circulatory system
Working with a partner, draw arrows inside the picture on your guided worksheet
showing how you think blood flows through the heart.

3. Deoxygenated
blood travels back
to the heart into
the right Atrium
The Right
Ventricle pumps
deoxygenated
blood into the
lungs through the
Pulmonary Artery
Oxygenated blood
flows through
Pulmonary Veins
into Left Atrium
Left Ventricle
pumps oxygenated
blood through the
Aorta
Oxygenated blood
travels through
blood vessels to
organs and
muscles
Were you and your
partner right?
The flow of
blood
through the
heart

4. Finding Your Pulse and Recap
2 Ways to find your pulse…
1. Radial Pulse
2. Carotid Pulse
Calculate your resting heart rate. 1. Find your pulse, and count how many pulses you feel for 1
minute. 2. Write down your resting heart rate in the space provided on your guided worksheet.

5. Let’s Exercise!
Starley - Call on Me (Ryan Riback Remix)

6. What do Y’all Think?
1) Working in your group of 4, compare your heart rates directly after
exercise.
2) Were all of your heart rates the same?
3) Whose was the highest, the lowest?
4) Why do you think your heart rate increased? Come to a final
conclusion as a group and select one spokesperson to explain your
answer to the class.
Calculate your
heart rate now.
1. Find your
pulse, and count
how many pulses
you feel for 1
minute.
2. Write down
your heart rate
directly after
exercise in the
space provided
on your guided
worksheet.

7. So Why does Heart Rate Increase During
Exercise?
Change of blood flow. Blood flow increases and stroke
volume increases to supply blood to the major skeletal
muscles involved during exercise.
Stroke volume – the amount of blood pumped by
the left ventricle
Muscles need oxygen to contract and function; 100% of
capillaries open to increase blood flow to skeletal muscle.
Capillaries – the smallest blood vessels in the
circulatory system
Breathing rate also increases. The muscles need more
oxygen to function at a higher rate and more carbon dioxide
needs to be released.

8. Why is
Everyone’s Heart
Rate Different?1. Body size
2. Previous experience with exercise
3. Fitness levels
4. Health levels
5. Genetics
Working in your group of 4, think about 2 different reasons why
heart rates vary from person to person. Both resting and heart
rate after exercise.

9. Recovery Heart Rate
Recovery heart rate is the amount of time it takes the
heart to return to normal after physical activity.
A healthy, conditioned heart will recover more quickly
after exercise than a deconditioned heart.
2-Minute Recovery
Measure your heart rate immediately after exercise. Wait
2 minutes to take your recovery heart rate.
2-Minute Recovery HR – Working HR = Base Line
for Improvement
Measure your heart rate! Find your pulse and count how many pulses you feel for 1
minute. Is your heart rate back to normal?

10. What did We Learn?
1. We learned how to find our pulse 2 different ways.
2. We learned that the heart is a muscle and it needs to get exercise just
like our other muscles.
3. We learned how to measure our heart rates and track for
improvement.
4. What else did we learn?