Question

question 22

_ is to contraction as _ is to relaxation.

a) systole; diastole
b) diastole; systole
c) filling; relaxing
d) systole; filling
e) both a and d

Explanation:

Analyze the analogy structure

The question presents an analogy: "\_\_\_\_\_ is to contraction as \_\_\_\_\_ is to relaxation." We need to find a pair of terms where the first term corresponds to contraction and the second term corresponds to relaxation.

Define the physiological terms

Using our understanding of the Cardiac Cycle, we define the key terms:

• Systole refers to the phase of the cardiac cycle when the heart muscle contracts to pump blood.
• Diastole refers to the phase of the cardiac cycle when the heart muscle relaxes and allows the chambers to fill with blood.

Evaluate the given options

• A) Systole; diastole: Systole corresponds to contraction, and diastole corresponds to relaxation. This matches the analogy perfectly.
• B) Diastole; systole: This is the reverse order (relaxation; contraction).
• C) Filling; relaxing: Filling is a result of relaxation, not contraction.
• D) Systole; filling: While systole is contraction, filling is a passive/active process during diastole, not the direct term for relaxation itself.
• E) both A and D: Since D is incorrect, E is also incorrect.

Select the correct option

Option A correctly completes the analogy: "Systole is to contraction as diastole is to relaxation."

Answer:

• (A) Systole; diastole (Correct answer)
• (B) Diastole; systole
• (C) Filling; relaxing
• (D) Systole; filling
• (E) both A and D