Which of the following statement is wrong ?

Options

A. The cardiac output of a person varies according to his physiological demand
B. Stroke volume of heart is almost equal to the amount of blood transferred from left atrium to left ventricle
C. Stroke volume is the amount of blood pumped by the left ventricle in the systemic aorta in one beat
D. End systolic volume of atria is about 50 ml

Answer

To determine which statement is wrong, we will analyze each statement one by one based on our understanding of cardiac physiology.

### Step-by-Step Solution:

1. **Analyze the First Statement:**
- The first statement claims that "the cardiac output of a person varies according to his physiological demands."
- **Evaluation:** This statement is true. Cardiac output, which is the volume of blood the heart pumps per minute, does indeed vary based on factors such as exercise, stress, and metabolic needs.

2. **Analyze the Second Statement:**
- The second statement states, "Stroke volume of heart is almost equal to the amount of blood transferred from left atrium to left ventricle."
- **Evaluation:** This statement is also true. Stroke volume refers to the amount of blood pumped by the left ventricle in one contraction, which is closely related to the volume of blood that fills the left ventricle from the left atrium.

3. **Analyze the Third Statement:**
- The third statement claims, "The stroke volume is the amount of blood pumped by the left ventricle into the systemic aorta in one week."
- **Evaluation:** This statement is misleading. Stroke volume is defined as the amount of blood ejected by the left ventricle in one contraction (not over a week). Thus, this statement is false.

4. **Analyze the Fourth Statement:**
- The fourth statement mentions, "The end systolic volume for artery is above 50 ml."
- **Evaluation:** This statement is incorrect because end systolic volume refers to the volume of blood remaining in the ventricle after contraction, not in an artery. The end systolic volume is typically less than 50 ml in a healthy adult heart.

### Conclusion:
Based on the evaluations, the wrong statement is the third one: "The stroke volume is the amount of blood pumped by the left ventricle into the systemic aorta in one week."

### Final Answer:
The wrong statement is the third one.

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