video record
Media not available in the Digital Archive
The programme is partially concerned with the elementary biology of the respiratory system. It also contains demonstrations of simple respiratory phenomena: a) Hyper ventilation (over breathing) pr...oducing cessation of breathing b) Exercise - affect on respiratory and cardiac rate c) Hyper ventilation - lowering the blood oarbon dioxide levels d) Affect of increased carbon dioxide levels on respiratory rate and volume. Programme concludes with a discussion between Professor Beishon and Dr. Capel on the degree to which the simple control model is applicable to clinical practice.
Metadata describing this Open University video programme
Module code and title: T241, Systems behaviour
Item code: T241; 13
First transmission date: 17-06-1973
Published: 1973
Rights Statement:
Restrictions on use:
Duration: 00:20:43
+ Show more...
Producer: John Groom
Contributors: Ronald John Beishon; L H Capel
Publisher: BBC Open University
Keyword(s): Biological systems; Circulatory systems; Hyperventilation; Respiratory systems
Footage description: John Beishon with a subject who is Hyperventilating into a device which measures ventilation volume and rate. After several seconds of hyper ventilation the subject can stop breathing altogether for a few seconds. He feeld no compulsion to breathe. A pen recorder records this phenomenum. John Beishon introduces the programme. He tells what material will be covered. Beishon with a cut-away, full scale model of a human body. He takes the chest cavity apart and points out the various organs and tissues which are involved in the respiration process. Shot of chest X-Ray. Beishon points out the various components of the chest as he did on the model. Beishon uses two X-Ray photographs of the chest to explain the breathing process, 1) person breathing in 2) person breathing out. The two are superimposed and shown sequentially. Beishon continues his explanation of the human breathing process. Shot of a plastic model of a human bronchial tree. Film shots of the inside of the upper bronchial tubes. The instruments used in a bronchiscope. The subject is under a general anesthetic in an operating theatre. Another shot of plastic model of a human bronchial tree showing many more subdivisions of bronchial tubes. Beishon holds a plastic model of the end of a bronchial tube. He explains how gas exchange takes place in the alveola (air sacs) at the end of the tube. Magnified shots of alveoli. Beishon explains how the process of gas exchange takes place there. Highly magnified shot of blood flow through capillories around the alveoli. Commentary by Beishon explains how gas is diffused through the membrane. Beishon uses a diagram of part of the circulatory system (human) to help explain the process of respiration. Shot of a subject pedalling on a stationary excercise cycle. His breathing is monitored and recorded on a pen recorder graph. Subjects' heart rate is recorded on a heart rate meter. Both heart rate and breathing rate rise as subject exercises vigorously. Beishon begins his explanation of the way in which breathing is monitored and controlled by the brain and feedback mechanisms in various parts of the body. Experiment to measure the percentage amount of C02 gas in the air sacs of the lungs. Subject breathes into monitoring device. Beishon explains the device and the experiment commences. As the subject hyperventilates the C02 level drops. Subject now breathes air with a 10% C02 content (10X higher than normal). His response is displayed on the pen recorder. Breathing is seen to become faster and deeper. Beishon with diagram of part of the human respiratory system. He explains how level of C02 in the blood is monitored, and how this causes respiration rate to be controlled. Beishon examines the respiratory ccntrol of the brain. He uses a model as an aid. Dr. L.H.Capel discusses the use of models such as the one above in the study of the respiratory system. He explains why the respiratory system cannot be studied without also considering neural control over the system. The value of taking a systems analysis approach is discussed, not only for study of the respiratory system, but for medicine as a whole.
Master spool number: 6HT/70892
Production number: 00525_5022
Videofinder number: 2714
Available to public: no