# Which of the following determines the direction of gas movement in the blood?

## Which of the following determines the direction of gas movement in the blood?

Which of the following determines the direction of gas movement? the bronchial arteries. chemically combined with the heme in red blood cells. Which of the following has the greatest stimulation effect on the respiratory centers in the brain?

## What factor determines the direction and degree of diffusion of a gas?

The rate of diffusion is determined by a variety of factors, including the concentration gradient of the gases and the partial pressure of the gases.

## What is the direction of diffusion of gases?

Gases move in both directions during diffusion, but the area of higher partial pressure, because of its greater number of molecules per unit volume, has proportionately more random “departures.” Thus, the net movement of gas is dependent on the partial pressure difference between the 2 areas.

## Which direction do gases diffuse at the arterial end of the pulmonary capillaries quizlet?

Which direction do gases diffuse at the arterial end of the pulmonary capillaries? O2 diffuses from the alveoli into the blood, while CO2 diffuses from the blood into the alveoli.

## What determines the direction of gas movement in the alveoli?

Gas movement into or out of the lungs is dependent on the pressure of the gas. Air is a mixture of gases; therefore, the partial pressure of each gas can be calculated to determine how the gas will flow in the lung.

## What is alveolar PCO2?

The partial pressure of carbon dioxide (PCO2) is the measure of carbon dioxide within arterial or venous blood. It often serves as a marker of sufficient alveolar ventilation within the lungs. Generally, under normal physiologic conditions, the value of PCO2 ranges between 35 to 45 mmHg, or 4.7 to 6.0 kPa.

## What factors affect gas exchange?

What Factors Affect Gas Exchange In The Lungs?

• The thickness of the membrane.
• The surface area of the membrane.
• The difference in pressure across membranes.
• Diffusion coefficient of the gas.

## How does pressure influence the movement of gases?

The greater the partial pressure of a gas, the more of that gas will dissolve in a liquid, as the gas moves toward equilibrium. Gas molecules move down a pressure gradient; in other words, gas moves from a region of high pressure to a region of low pressure.

## What determines direction of diffusion?

So diffusion occurs from the region of high to low, high concentration to low concentration. So are related concentration gradient determines the diffusion direction.

## What determines the direction of diffusion of gases in plants?

The direction of diffusion in plants depends upon the concentration gradient of the ion for a particular substance and the membrane potential.

## Which of the following best describes the direction that gases diffuse at the pulmonary capillaries of the lungs is?

Which direction do gases diffuse at the arterial end of the pulmonary capillaries? O2 diffuses from the alveoli into the blood, while CO2 diffuses from the blood into the alveoli.

## How does gas move between the alveoli and pulmonary capillaries?

The walls of the alveoli share a membrane with the capillaries. That's how close they are. This lets oxygen and carbon dioxide diffuse, or move freely, between the respiratory system and the bloodstream. Oxygen molecules attach to red blood cells, which travel back to the heart.

## How do gases move across the respiratory membrane?

Gas exchange during respiration occurs primarily through diffusion. Diffusion is a process in which transport is driven by a concentration gradient. Gas molecules move from a region of high concentration to a region of low concentration.

## What determines pCO2?

pCO2 (partial pressure of carbon dioxide) reflects the the amount of carbon dioxide gas dissolved in the blood. Indirectly, the pCO2 reflects the exchange of this gas through the lungs to the outside air. Two factors each have a significant impact on the pCO2.

## What determines alveolar pCO2?

The factors that determine the values for alveolar pO2 and pCO2 are: The pressure of outside air. The partial pressures of inspired oxygen and carbon dioxide. The rates of total body oxygen consumption and carbon dioxide production.

## What determines the direction of gas movements in internal respiration?

Gas movement into or out of the lungs is dependent on the pressure of the gas. Air is a mixture of gases; therefore, the partial pressure of each gas can be calculated to determine how the gas will flow in the lung.

## How does pressure influence the movement of gases quizlet?

Gas moves from higher partial pressure to region of lower partial pressure, continues until pressure is equal. *Alveolar/Systemic gas exchange depend upon these gradients. *Greater partial pressure, the more rapid movement of gas.

## What factor determines the direction that gas molecules will diffuse quizlet?

What determines the direction of diffusion? The concentration gradient-high concentration to low. There is a net movement of each substance from an area of high concentration to low concentration.

## What determines the direction by which molecules diffuse across the cell membrane?

No external source of energy is provided, so molecules travel across the membrane in the direction determined by their concentration gradients and, in the case of charged molecules, by the electric potential across the membrane.

## What 3 factors determine the direction of diffusion?

Diffusion of substances plays an important role in cellular transport in plants. The rate of diffusion is affected by the concentration gradient, membrane permeability, temperature, and pressure. Diffusion takes place as long as there is a difference between the concentrations of a substance across a barrier.

## Which correctly describes the direction of gases during internal respiration?

Which of the following correctly describes the gas exchange occurring during internal respiration? Oxygen diffuses out of the blood, and carbon dioxide diffuses into the blood.

## What is the process of gas exchange in the alveoli called?

In a process called diffusion, oxygen moves from the alveoli to the blood through the capillaries (tiny blood vessels) lining the alveolar walls.

## What force is responsible for the movement of these gases in the alveoli?

Gas molecules move down a pressure gradient; in other words, gas moves from a region of high pressure to a region of low pressure. The partial pressure of oxygen is high in the alveoli and low in the blood of the pulmonary capillaries.

## Which term is used to identify the movement of gas and air into and out of the lungs?

Pulmonary ventilation is commonly referred to as breathing. It is the process of air flowing into the lungs during inspiration (inhalation) and out of the lungs during expiration (exhalation). Air flows because of pressure differences between the atmosphere and the gases inside the lungs.

## What does PCO2 measure?

The partial pressure of carbon dioxide (PCO2) is the measure of carbon dioxide within arterial or venous blood. It often serves as a marker of sufficient alveolar ventilation within the lungs. Generally, under normal physiologic conditions, the value of PCO2 ranges between 35 to 45 mmHg, or 4.7 to 6.0 kPa.

## What is pO2 and PCO2?

pCO2 (partial pressure of carbon dioxide) pO2 (partial pressure of oxygen)

## Which three are the determinants of alveolar PO2?

Notice that alveolar PO2 is determined by three factors: 1. PO2 of atmospheric air 2. Alveolar ventilation rate 3. Rate of tissue O2 consumption (RQ).

## What factors determine alveolar partial pressures?

The factors that determine the values for alveolar pO2 and pCO2 are:

• The pressure of outside air.
• The partial pressures of inspired oxygen and carbon dioxide.
• The rates of total body oxygen consumption and carbon dioxide production.
• The rates of alveolar ventilation and perfusion.

## What is the mechanism of gas exchange?

The basic mechanism of gas exchange is diffusion across a moist membrane. Diffusion is the movement of molecules from a region of greater concentration to a region of lesser concentration, in the direction following the concentration gradient.

## What is the pressure gradient How do pressure gradients drive the movement of gases into and out of the lungs quizlet?

That is differences in pressure between one area and another (atmosphere and lungs). Gas molecules move from areas of HIGH pressure TO areas of LOW pressure. These pressure gradients are what DRIVE the movement of air molecules during INSPIRATION and EXPIRATION.