WorksheetsFactors Affecting Rate of Diffusion Across Membranes
Total questions: 15
Worksheet time: 8mins
Which variable increases the rate of diffusion across a membrane by providing a greater driving force for gas exchange?
Partial pressure
Solubility
Surface area
Diffusion distance
What effect does a high solubility of a gas have on its rate of diffusion?
It increases the rate of diffusion
It decreases the rate of diffusion
It has no effect on diffusion
It stops diffusion completely
How does increasing the surface area of a membrane affect the rate of diffusion?
It increases the rate of diffusion
It decreases the rate of diffusion
It does not change the rate of diffusion
It reverses the direction of diffusion
What happens to the rate of diffusion if the thickness of the respiratory membrane increases?
The rate of diffusion decreases
The rate of diffusion increases
The rate of diffusion stays the same
The rate of diffusion stops completely
Which of the following is NOT a variable that affects the rate of diffusion across a membrane?
Temperature
Partial pressure
Solubility
Surface area
What is perfusion in the context of the respiratory system?
The flow of blood through capillaries
The movement of air into the lungs
The exchange of gases in the alveoli
The contraction of respiratory muscles
What happens when perfusion is higher than ventilation in the lungs?
More blood flows than air reaches the alveoli
More air reaches the alveoli than blood flows
Gas exchange is maximized
Oxygen levels in the blood decrease
What is the usual result of ventilation-perfusion coupling?
Matching of air flow and blood flow in the lungs
Increase in blood pressure
Decrease in oxygen levels
Increase in carbon dioxide levels
What is internal respiration?
Exchange of gases between blood and tissues
Exchange of gases in the alveoli
Movement of air into the lungs
Transport of oxygen in the blood
What happens during internal respiration?
Oxygen moves from blood to tissues and carbon dioxide moves from tissues to blood
Oxygen moves from alveoli to blood
Carbon dioxide moves from blood to alveoli
Air moves into the lungs
What is the main reason why oxygen is unloaded more quickly from hemoglobin during exercise?
Increased carbon dioxide and decreased pH in tissues
Decreased carbon dioxide and increased pH in tissues
Increased oxygen concentration in tissues
Decreased temperature in tissues
What effect does increased temperature have on the affinity of hemoglobin for oxygen?
Decreases affinity
Increases affinity
No effect
Affinity fluctuates randomly
Which of the following shifts the oxygen-hemoglobin dissociation curve to the right?
Increased carbon dioxide
Decreased carbon dioxide
Increased oxygen
Decreased temperature
What happens to the affinity of hemoglobin for oxygen when the pH decreases?
Affinity decreases
Affinity increases
Affinity remains the same
Affinity is not affected by pH
Why does the oxygen-hemoglobin dissociation curve shift to the right during exercise?
Increased temperature, increased CO2, and decreased pH
Decreased temperature, decreased CO2, and increased pH
Increased oxygen and decreased CO2
Decreased oxygen and increased pH
