According to Mao and Lin, Which of the Following Was

question 18

Multiple Choice

According to Mao and Lin, which of the following was one of the four "olds"?

• A) old people
• B) old technology
• C) old ideas
• D) old machinery

---

Definitions:

Pulmonary Vein

The blood vessel that carries oxygenated blood from the lungs back to the left atrium of the heart.

Left Atrium

One of the four chambers of the heart, receiving oxygenated blood from the lungs and pumping it to the left ventricle.

Premature Atrial Contractions

Early heartbeats originating in the atria, often perceived as a skipped beat and usually benign but can indicate underlying health issues.

Atria

The upper chambers of the heart.