Exam 27: A: Physiology of the Respiratory System

Increased cellular activity would increase the oxygen gradient between the cells and the arterial blood.

Pulmonary ventilation is a technical term for what most people call breathing.

Oxygenated blood contains equal amounts of both dissolved oxygen and oxygen combined with hemoglobin.

A healthy respiratory system will still contain a certain amount of dead air space.

The chloride shift is an important step of oxygen transport in the blood.

The apneustic center is located in the medulla of the brain.

In a resting person,the oxygen saturation in the systemic venous blood is still about 50%.

The pneumotaxic center is located in the pons of the brain.

As lung compliance decreases,the efficiency of respiration increases.

The presence of hemoglobin in the blood approximately doubles the oxygen-carrying capacity of plasma alone.

The major factor that determines the movement of air into or out of the lungs is a pressure gradient.

For cells to get oxygen,they must have an oxygen partial pressure lower than the arterial blood serving them.

An increase in carbon dioxide would have the opposite effect on oxygen-hemoglobin dissociation than would a drop in blood pH.

There is one iron atom in one heme group.

Under usual conditions,the oxygen saturation of systemic venous blood is 75%.

A relatively small rise in arterial carbon dioxide partial pressure stimulates an increase in breathing rate.

When the diaphragm relaxes,it increases the size of the chest cavity,causing air to move into the lung.