In this article we will discuss about the contents of CO2 in blood of human beings with the help of suitable diagrams. CO2 Content and Tension of Blood: Arterial blood contains about 48 volume of CO2 and venous blood 52 volume of CO2 per 100 ml, tension of CO2 being 40 mm Hg and 46 mm Hg in the arterial [...]
The normal rate or respiration in an adult is 14 to 18 per minute with a tidal volume of about 500 ml. The rate and depth of respiration (pulmonary ventilation per minute) is adjusted according to requirement of the body. For instance during muscular exercise metabolic activities are increased and the demand for oxygen by the working muscles is increased. [...]
Two separate processes are involved in vocalisation: 1. Phonation 2. Atriculation. Process # 1. Phonation: The whole process is dominated and co-ordinated by speech centre in the cerebral cortex, damage to which will lead to permanent aphasia. Phonation is due to vibration of vocal cords which are folds stretched along the lateral wall of the larynx between thyroid and arytenoid [...]