HA HEART AND NECK VESSELS Flashcards
is highly complex, consisting of the heart and a closed
system of blood vessels.
cardiovascular system
To collect accurate data and correctly interpret it
the
examiner must have an understanding of the structure and function of the
- heart,
- the great vessels,
- the electrical conduction system of the heart,
- the cardiac cycle,
- the production of heart sounds,
- cardiac output (CO)
-the neck vessels.
is a hollow, muscular, four-chambered (left and right atria, and left and
right ventricles) organ located in the middle of the thoracic cavity between the lungs
in the space called the mediastinum.
Heart
in the middle of the thoracic cavity between the lungs
in the space called
mediastinum.
Size of the Heart
-size of a clenched fist -255 g (9 oz) in women -310 g (10.9 oz) in men.
The heart extends
vertically from
the left second to the left fifth intercostal space (ICS)
The heart extends
horizontally from
the right edge of the sternum to the left midclavicular line (MCL).
The heart can be described as
inverted cone
Base
The upper portion, near the left second ICS
Apex
the lower portion, near the left fifth ICS and the left MCL,
The anterior chest area that overlies the heart and great vessels is called the
precordium
pumps blood to the lungs for
gas exchange (pulmonary circulation) by removing CO2 from blood and
replenishing oxygen supply. It occurs between alveoli and the blood of lungs
The right side of the heart
pumps blood to all other parts of the body (systemic circulation).
; the left side of the heart
The large veins and arteries leading directly to and away from the heart are referred to as the
great vessels
return blood to
the right atrium from the upper and lower torsos, respectively.
The superior and inferior vena cava
exits the right ventricle, bifurcates, and carries blood to the lungs.
pulmonary
artery
return oxygenated blood to the left atrium.
pulmonary veins (two from each lung)
transports oxygenated blood from the left ventricle to the body
aorta
The heart consists of four chambers, or cavities:
two upper chambers
-the right and
left atria,
two lower chambers,
-the right and left ventricles.
The right and left
sides of the heart are separated by a partition called
septum
receive blood returning to the heart and pump blood into the ventricles.
The thin-walled
atria
pump blood out of the heart.
The
thicker-walled ventricles
true/false
The left ventricle is thicker than the right ventricle
True
which side of the heart has greaer workload
left sideof the heart
are located at the entrance to the ventricles.
atrioventricular (AV) valves
There are two AV valves:
-the tricuspid
valve
-the bicuspid (mitral) valve.
is composed of three
cusps, or flaps, and is located between the right atrium and the right ventricle
tricuspid valve
is composed of two cusps and is located between the left
atrium and the left ventricle.
the
bicuspid (mitral) valve
called chordae tendineae, anchor the
AV valve flaps to papillary muscles within the ventricles.
Collagen fibers
are located at the exit of each ventricle at the beginning of the great vessels.
semilunar valves