DEVELOPMENTAL PROCESSES IN RESPIRATION:
The lungs undergo a great deal of prenatal
development.
By the time the infant is born, the cartilaginous
conducting airway is complete, although there
will be an increase in the number of alveoli till
the age of 8 years (300 million).
, The conducting airways will grow steadily in
diameter and length until thorax growth is
complete, although the thorax will expand to a
greater degree than lungs.
Adults breathe between 12-18 times per
minute while at rest, but newborns will
breathe an average of 40-70 cycles per minute.
By 5 years the child is about 25 bpm (breaths
per min), and that number drops to about 20
bpm at 15 years of age.
Unlike adults, infants do not have residual
volume (air that is left in lungs that cannot be
expelled).
Lung volumes and capacities:
Respiration is the product of a number of forces and
structures, and to make sense, it is necessary to define
volumes and capacities of lungs.
When we refer to volumes, we are partitioning off the
The lungs undergo a great deal of prenatal
development.
By the time the infant is born, the cartilaginous
conducting airway is complete, although there
will be an increase in the number of alveoli till
the age of 8 years (300 million).
, The conducting airways will grow steadily in
diameter and length until thorax growth is
complete, although the thorax will expand to a
greater degree than lungs.
Adults breathe between 12-18 times per
minute while at rest, but newborns will
breathe an average of 40-70 cycles per minute.
By 5 years the child is about 25 bpm (breaths
per min), and that number drops to about 20
bpm at 15 years of age.
Unlike adults, infants do not have residual
volume (air that is left in lungs that cannot be
expelled).
Lung volumes and capacities:
Respiration is the product of a number of forces and
structures, and to make sense, it is necessary to define
volumes and capacities of lungs.
When we refer to volumes, we are partitioning off the
