Gas Exchange iClicker Questions

The process by which organisms deliver water or air to their respiratory surfaces is called _______.

Ventilation

Contraction of the diaphragm causes _______ in the volume and ________ in the pressure of the chest cavity. This results in ________.

an increase; a decrease; inhalation

Inhalation

Low pressure in lung

Exhalation

High pressure in lungs

For oxygen to diffuse into and out of the blood as expected, where would you find the lowest partial pressure of oxygen in the blood stream?

The left side of the image (systemic veins/pulmonary artery)

How does oxygen get from the pulmonary capillaries to the systemic capillaries?

Transport in blood

________ drive external and internal respiration

partial pressure gradients

True or false: Partial pressure gradients of oxygen are also primarily responsible for the movement of oxygen from your pulmonary capillary bed to your systemic capillary bed.

False

The rates of external and internal respiration are driven by _________ _________. Your _________ rate and rate of cell _________ (or metabolic rate) can influence these.

partial pressure gradients; breathing; respiration

________ and your _________ help oxygen move
through the blood stream

hemoglobin; heart

What causes blood pH to lower from 7.4 to 7.2?

Increase in CO2 in the blood

In the diagram below, which letter should be labeled “CO2 concentration decreases”?

A

Which of the following would lower the concentration of oxygen in your blood?

Low air pressure outside the body

When Charles is admitted to the hospital, they measure the partial pressure of oxygen and carbon dioxide in his arteries (=blood gas). Charles’ PCO2 is 39 mmHg, while his PO2 is 101 mmHg. Are these values approximately normal?

Yes

Fundamentally, Charles’ condition (low % O2 saturation of hemoglobin) occurred as a result of a problem/malfunction during _______.

transport of gases between the alveolar capillaries and capillary beds in other tissues

Comparing expectations of blood gas and % O2 saturation test results, Charles’ disorder is most similar to which other disorder?

anemia (low iron levels in the blood)

Which blood has more CO2?

Blood with pH of 7.2