explain the mechanism of respiration
Answers
Explanation:
Mechanism of Respiration in Human
Respiration is simply defined as the exchange of oxygen and carbon dioxide into the body.
Physiology of respiration can be described under following phases:
External respiration
Transport of oxygen
Internal respiration
Transport of carbon dioxide
physiology-of-respiration
External respiration
It is the first step of respiration.
It occurs in lungs.
It is the exchange of gases by diffusion between alveoli and blood in blood vessel, across respiratory membrane.
During inspiration, oxygen is taken into the lungs. The partial pressure of oxygen in lungs is higher than that in blood capillaries.
Therefore, oxygen diffuses from the lungs to the blood.
Similarly, the venous blood contain high level of CO2 in comparison to lungs. Due to high partial pressure of CO2 in blood and low CO2 in lungs, the CO2 diffuses from the blood into the lungs in order to maintain the equilibrium.
Transport of oxygen
Oxygen is transported from lungs to the tissue in blood.
Plasma and RBC are helpful in transporting the oxygen.
Water present in plasma has poor solubility for oxygen, so it carries only 3% of total oxygen.
Most of the oxygen (about 97% of total oxygen) is transported by RBC.
RBC has a respiratory pigment hemoglobin which combines with oxygen to form oxyhemoglobin due to high affinity of hemoglobin with oxygen.
Almost all oxygen are transported in this form, from lungs to tissue.
Hb4 + 4O2 Hb4O8
Oxyhemoglobin compound is highly unstable compound and thus can dissociate quickly as it reaches to tissue.
NOTE: One hemoglobin molecules contain 4 heme group; each heme can combine with oxygen. Therefore, one Hb can combine with 4 molecules of oxygen. A normal adult person has 15 gram hemoglobin per 100ml of blood. 1 gm of Hb can carry upto 1.34 ml of oxygen. 100 ml of blood conatains about 20ml of oxygen.
Answer:
The mechanism of respirationinvolves the following four stages: Breathing: It is a physical process in which oxygen rich air is taken inside the body (inspiration) and carbon dioxide rich air is forced out of the lungs (expiration).
HOPE IT HELPS YOU PLSSS MARK IT AS BRAINLIST