Answer to Question #285167 in Biology for Ali

Question

1_write the two equations that represent the gas exchange between blood and air

2_Explain the change of blood color when passing through a pulmonary alveolus

3_name the blood components transporting the respiratory gases

4_Name the form by which these respiratory gases are transported

Answer 1

1. The lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out (called expiration, or exhalation). This exchange of oxygen and carbon dioxide is called respiration.

The alveolar gas equation is a formula used to approximate the partial pressure of oxygen in the alveolus (PAO2):PAO2=(PB−PH2O)FiO2−(PaCO2÷R)where PB is the barometric pressure, PH2O is the water vapor pressure (usually 47mmHg), FiO2 is the fractional concentration of inspired oxygen, and R is the gas exchange ratio.

2.Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli. That is why the color of blood changes.

3.Red blood cells (also called erythrocytes ) transport the oxygen required for aerobic respiration in body cells. They must be able to absorb oxygen in the lungs, pass through narrow blood capillaries , and release this oxygen to respiring cells.

4.Oxygen is transported in the blood in two ways: A small amount of O ₂ (1.5 percent) is carried in the plasma as a dissolved gas. Most oxygen (98.5 percent) carried in the blood is bound to the protein hemoglobin in red blood cells.