Respiratory system - developmental changes, Biology

Respiratory System - Developmental Changes after Birth

The new-born's lungs are collapsed and need powerful breaths to inflate them; airways too are small, offering remarkable resistance to flow of air. The surface tension tends to hold the moist membranes together. The lungs of a full term baby secrete surfactant that has the unique property of exerting high surface tension while the lungs an expanded but a low surface tension while the lungs are collapsed. So after the first powerful breath which expands the lungs, breathing becomes easier, due to the reduced surface tension of collapsed lungs.

Posted Date: 2/1/2013 3:15:41 AM | Location : United States







Related Discussions:- Respiratory system - developmental changes, Assignment Help, Ask Question on Respiratory system - developmental changes, Get Answer, Expert's Help, Respiratory system - developmental changes Discussions

Write discussion on Respiratory system - developmental changes
Your posts are moderated
Related Questions
What is the excreatory organ in agama lizard

DIFFERENCE S BETWEEN HYPOTHESIS AND THEORY -     1. Hypothesis   It is a reasoned or educated guess about a     1.

Medical Research - Conservation of Wildlife  Many animal species are used to test drugs and vaccines and to increase our understanding of human health and disease. The nine-b

SEMEN - Sperms and secretion of accesory glands collectively known as seminal fluid or semen. It is milky, semi-solid in nature having particular smell. pH : 7.35 - 7.5. Spe

What is the difference between the lateral and the apical buds of the plants? Lateral buds are portions of meristematic tissue situated in the base of the shoots. Apical bud

Define Energy Requirement for Cancer Patients? It must be clear to you that cancer imposes increased energy demands because of the hyper-metabolic state of the disease process

prototherians are unfinished mammals

Describe Physical Inactivity in lifestyle risk factors? Prospective epidemiological studies have shown that a sedentary lifestyle is associated with an adverse effect on the ri

Explain the Sticky Films - Food Microbiology? Sticky films or tape are pressed against the surface to be assessed. Exposed film/tape is then pressed on the agar plate and analy

REGUL A TIV E THEORY It was propounded by Hens Driesch. He performed experiments on the eggs of sea urchin similar to the experiments performed by Roux. He observed