Multiple Choice
Which of the following would result in no change in osmotic pressure across a semipermeable membrane?
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6. The Membrane
Osmosis
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Which of the following characteristics most directly affects the diffusion of oxygen into the icefish’s blood?
A
The temperature of the icefish’s food
B
The color of the icefish’s scales
C
The presence of glucose in the blood
D
The concentration gradient of oxygen between water and blood
Verified step by step guidance1
Understand the concept of diffusion: Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. In biological systems, this process is driven by the concentration gradient.
Identify the key factor in oxygen diffusion: The concentration gradient of oxygen between water and blood is the driving force for oxygen to move into the icefish's blood. A higher gradient means faster diffusion.
Eliminate irrelevant factors: The temperature of the icefish’s food, the color of its scales, and the presence of glucose in the blood do not directly influence the diffusion of oxygen. These factors are unrelated to the concentration gradient of oxygen.
Relate the concentration gradient to the icefish’s environment: Icefish live in cold, oxygen-rich waters. The oxygen concentration in the water is typically higher than in the blood, creating a favorable gradient for diffusion.
Conclude the importance of the concentration gradient: The concentration gradient of oxygen between water and blood is the most direct factor affecting the diffusion of oxygen into the icefish’s blood, as it determines the rate and direction of oxygen movement.
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