Circulatory system

17. SYSTEMIC AND PULMONARY
CIRCULATION
Pulmonary circulation
The flow of blood
between the heart
and lungs.
Systemic circulation
The flow of blood
between the heart
and parts of the
body.

26. One cardiac cycle – two heart sounds (lubb and dubb)
when valves in the heart snap shut
Lubb – First sound
When the ventricles contract, the tricuspid and bicuspid valves snap shut
Dubb – Second sound
When the atria contract and the pulmonary and aortic valves snap shut

48. Tracing the flow of blood… the arteries
Count the number of beats for
15 seconds x 4 = pulsations per minute.
The average
pulse rate for
a person who
is ‘resting’,
would be 70.
During
exercise, that
number might
increase to
between 130
and 140 beats
per minute.

50. A typical blood pressure
reading would be expressed as
120/80… 120 over 80. A
reading of 140/90 would be
considered ‘high’ blood
pressure, and may pose health
risks.

51. Measuring Arterial Blood Pressure

52. Variations in Blood Pressure
 Human normal range is variable
Normal
140–110 mm Hg systolic
80–75 mm Hg diastolic
Hypotension
Low systolic (below 110 mm HG)
Often associated with illness
Hypertension
High systolic (above 140 mm HG)
Can be dangerous if it is chronic