Question

blood oxygen graphs three - level guide
directions:

• annotate the graph, based on the directions in step 1.
• use the graph to respond to the prompts in step 2.
• use the graph and your knowledge of biology to respond to the prompts in step 3.

step 1 - reading the lines

1. read the title. underline the gas represented in this graph.
2. find the areas of the graph that represent rest. box in those areas by drawing a square around those portions of the graph.
3. find the data point in the graph with highest blood oxygen level, and circle it.
4. find the data point in the graph with lowest blood oxygen level, and circle it.

step 2 - reading between the lines

1. at rest, what is the o₂ concentration in arterial blood?
2. at rest, what is the o₂ concentration in venous blood?
3. describe the relationship between exercise and the concentration of o₂ in arterial blood.
4. describe the relationship between exercise and the concentration of o₂ in venous blood.

step 3 - reading beyond the lines

1. describe the difference between the o₂ concentration in arterial blood and the o₂ concentration in venous blood during exercise.

Explanation:

Step1: Read the title and underline oxygen

Since the title is "Blood Oxygen Graphs Three - Level Guide", the gas is oxygen.

Step2: Identify rest areas on graph

This requires visual inspection of the graph to box the rest - related areas.

Step3: Locate highest oxygen data point

Visual inspection of the graph to circle the point with the highest blood oxygen level.

Step4: Locate lowest oxygen data point

Visual inspection of the graph to circle the point with the lowest blood oxygen level.

Step5: Determine arterial oxygen at rest

Read the value from the graph for arterial blood oxygen concentration at rest.

Step6: Determine venous oxygen at rest

Read the value from the graph for venous blood oxygen concentration at rest.

Step7: Analyze exercise - arterial oxygen relationship

Observe the trend on the graph as exercise occurs to describe the relationship.

Step8: Analyze exercise - venous oxygen relationship

Observe the trend on the graph as exercise occurs to describe the relationship.

Step9: Analyze difference during exercise

Calculate and describe the difference between arterial and venous oxygen concentrations during exercise by subtracting the venous value from the arterial value on the graph.

Since the graph is not provided, we cannot give numerical answers. But the general process for answering Step 2 and Step 3 questions would be:
For Step 2:

1. The answer would be the value read from the graph for arterial blood oxygen at rest.
2. The answer would be the value read from the graph for venous blood oxygen at rest.
3. If the graph shows a decrease in arterial oxygen with increased exercise, the answer could be "As exercise increases, the O₂ concentration in arterial blood decreases." If it shows an increase or no change, the answer would be adjusted accordingly.
4. Similar to 3, observe the graph to describe the relationship, e.g., "As exercise increases, the O₂ concentration in venous blood decreases."

For Step 3:

1. Calculate the difference between the arterial and venous oxygen values on the graph during exercise and describe it, e.g., "During exercise, the difference between the O₂ concentration in arterial and venous blood is [X] units."

Answer:

Without the actual graph, specific numerical answers cannot be provided. For Step 1 tasks (underline oxygen, box rest areas, circle highest and lowest points), visual actions on the graph are required. For Step 2 and Step 3 questions, values and relationships are determined by reading and analyzing the graph as described above.