39 PQ2

Given the properties of myoglobin shown in the O2 saturation curve below, what advantage does myoglobin confer to contracting muscles?

It binds oxygen at pO2 values at which hemoglobin is releasing its bound O2, facilitating O2 delivery to muscle mitochondria.

The red curve in the graph below shows O2 saturation in normal conditions and the blue curve to the right shows O2 saturation in someone with carbon monoxide poisoning. You can determine from this curve that carbon monoxide:

decreases the amount of O2 that can bind to hemoglobin.

A mammalian fetus possesses a mutation that causes it to synthesize only adult hemoglobin. How will this mutation affect the fetus?

The fetus will derive less oxygen from its mother's bloodstream than it would with normal maternal hemoglobin.

What is meant by "tidal ventilation"?

Air moves into the lungs during inhalation and air moves out of the lungs during exhalation.