NASM CPT Textbook Notes Ch 3 Exam
Questions and Answers with Verified
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Cardiorespiratory system System of the body composed of the
cardiovascular and respiratory systems.
Cardiovascular System A system composed of the heart, blood,
and blood
vessels.
Heart A hollow muscular organ that pumps a
circulation
of blood through the body by means of
rhythmic
contraction.
Chest Thoracic cavity
Anteriorly In front
Posteriorly Behind
, Mediastinum The space in the chest between the lungs
that
contains all the internal organs of the chest
except
the lungs.
What is the average size of a The adult human heart is approximately
human the size of
heart? a typical adult fist and weighs roughly 300g
or
about 10oz.
Cardiac muscle Similar to skeletal muscle, its cells contain
myofibrils and sarcomeres aligned side by
side,
which give them their striated appearance.
It is
involuntary muscle, meaning that it cannot
typically
be consciously controlled.
Cardiac Muscle Fibers Shorter and more tightly connected than
skeletal
muscle fibers.
Sinoatrial SA
Sinoatrial (SA) node A specialized area of cardiac tissue,
located in the
right atrium of the heart, which initiates the
electrical impulses that determine the heart
rate;
often termed the pacemaker for the heart.
Questions and Answers with Verified
Solutions | Latest Updated 2026
Cardiorespiratory system System of the body composed of the
cardiovascular and respiratory systems.
Cardiovascular System A system composed of the heart, blood,
and blood
vessels.
Heart A hollow muscular organ that pumps a
circulation
of blood through the body by means of
rhythmic
contraction.
Chest Thoracic cavity
Anteriorly In front
Posteriorly Behind
, Mediastinum The space in the chest between the lungs
that
contains all the internal organs of the chest
except
the lungs.
What is the average size of a The adult human heart is approximately
human the size of
heart? a typical adult fist and weighs roughly 300g
or
about 10oz.
Cardiac muscle Similar to skeletal muscle, its cells contain
myofibrils and sarcomeres aligned side by
side,
which give them their striated appearance.
It is
involuntary muscle, meaning that it cannot
typically
be consciously controlled.
Cardiac Muscle Fibers Shorter and more tightly connected than
skeletal
muscle fibers.
Sinoatrial SA
Sinoatrial (SA) node A specialized area of cardiac tissue,
located in the
right atrium of the heart, which initiates the
electrical impulses that determine the heart
rate;
often termed the pacemaker for the heart.
