MANUAL PHYSIOLOGY PRACTICAL - Repository:The Medical ...

FM/UOJ
bellows to expand and collapse. Movement of the bellows rotates a gear that turns a
needle, pivoted on bearings across a calibrated dial.
Advantages and disadvantages of the two types of sphygmomanometer
Mercury – gravity
a. Great and permanent accuracy
and no need for re-calibration
b. Relatively bulky
c. Must be in vertical position
while in use
d. Breakable glass parts but easily
replaceable
Aneroid
a. Requires frequent calibration
b. Small and portable
c. Can be used in any convenient
position
d. Must be factory repaired if
becomes defective.
Cycle ergo-meter
It is a stationary cycle conveniently used for the performance of measured
amount of work in the laboratory where scientific measurements could be made while
performing the exercise. The seat, handle and the pedal resemble ordinary bicycle but
wheel is lifted from the round. Varying amount of resistance can be applied through
adjustable belt or suitable brake system. The work therefore can be altered in two ways:
speed and load.
Treadmill
It is a moving platform on which the subject walk or run at predetermined
speeds of the platform so that the subject will be in the same position for easy
monitoring of body parameters.
Metronome
It is a time device which could be set to produce loud ticking sounds at the
preferred time interval.
Plethysmograph
It is a rigid structure, which covers an organ. When connected to appropriate
sensor, changes in the volume within the instrument can be recorded and measured.
Volume recorder
It is an instrument to record volume change. It has a water bath in which an
inverted drum float, the space of the inverted drum is connected to the area where the
volume change is to be recorded. Displacement of air between the drum and the
measuring area will represent change in volume.
Circulation
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