Question

The upper chambers of the heart are called

• A. Auricles
• B. Ventricles
• C. Spiracles
• D. Tentacles

Answer 1

The correct option is A

Auricles

The correct option is option A.

Explanation of the correct option:

1. The upper two smaller chambers of the heart are called auricles and the lower two chambers of heat are called ventricles.
2. Auricles collect deoxygenated blood from parts of the body.
3. The right and left auricles are separated by the inter-artial septum.
4. The right auricle is linked with the right ventricle by the tricuspid valve and left auricle is linked with the left ventricle by the mitral valve.
5. The right auricle or atrium receives deoxygenated blood from the body via two veins (inferior and superior vein).
6. The left auricle or atrium receives oxygenated blood from the lungs via the pulmonary vein.

Explanation of the incorrect options:

Option B:

The two larger lower chambers of the heart are known as ventricles which pump the oxygenated blood to all the parts of the body.

Option C:

In the respiratory system of arthropods, the small opening of the trachea or breathing organ with folds of the membrane is called a spiracle.

Option D:

The elongated, flexible organ that is found near the mouth of invertebrates and some the vertebrates is called a tentacle.

Final Answer: the upper chambers of the heart are called auricles.