1. What is the relative partial pressures of oxygen in the alveoli, resting tiss
ID: 3514042 • Letter: 1
Question
1. What is the relative partial pressures of oxygen in the alveoli, resting tissue and exercising tissue?
a. How does solubility of a gas in a fluid influence the concentration of dissolved gas at a given partial pressure?
b. Describe how oxygen is transported in the blood AND why/how oxygen is “loaded” at the lung and “unloaded” at the tissue (hint, has to do with partial pressures and the Hb saturation curve).
c. How does hemoglobin increase the carrying capacity of blood for oxygen?
d. How does a developing fetus get enough oxygen from its mother’s blood?
Explanation / Answer
1. The relative partial pressure of oxygen in alveoli is about 100 mmHg.
PO2 in resting tissue is is about 40 mmHg.
PO2 in exercising tissue ranges up to 160 mmHg while breathing.
a.It is based on Henry's law of gas solubility. It states that concentration of gas in liquid is directly proportional to solubility and partial pressure of that gas. By this way solubility influences concentration of dissolved gas at a given partial pressure.
b. Oxygen is transported into blood through respiration. Oxygen is loaded in blood in pulmonary capillaries and it is unloaded in peripheral tissues.
c. Haemoglobin is the protein present in the red blood cells which carries oxygen to cells and carbondioxide to lungs. It is made up of 4 symmetrical subunits and 4 heme groups in which iron associated with the heme binds oxygen.
d. The umbilical cord connects to the placenta which is connected to uterus. After 5-6 weeks of pregnancy , the umbilical cord develops to deliver oxygen directly to the developing fetus is body. The mother breaths in for the baby and the oxygen in her blood is then transferred to baby's blood.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.