Subscribe now to access pointwise, categorized & easy to understand notes on 285 key topics of NEET Biology covering entire 2017 syllabus. All the updates for one year are also included. View Features or choose a topic to view more samples.

Rs. 350.00 or

Breathing and respiration

Breathing is the act of inhaling and exhaling air.

Respiration is interchange of gases between an organism and the medium in which it lives.

Comparison between Breathing and respiration: compared

Comparison between Breathing and respiration: compared

Sn.

Breathing

Respiration

1.

Is simple intake of fresh air and removal of foul air

Is oxidation of food to form CO2, water and energy

2.

It is a physical process

It… (51 more words) …

Subscribe & login to view complete study material.

Surface tension and surfactant

Surface tension is the force caused due to intermolecular attraction between the molecules on the surface because of which alveoli tend to collapse. In order to prevent this collapse the alveoli are lined by surface tension reducing substance called surfactant.

Surfactants are substances which reduce surface tension. Chemically it is Dipalmitoyal phosphatidylcholine. Production of surfactant starts by seventh month of intrauterine life.

Functions

  • It reduces surface tension, thus prevents collapse… (71 more words) …

Subscribe & login to view complete study material.

f Page
Sign In