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Which cartilage covers the opening of the trachea?

A.

Epiglottis

B.

Arytenoids

C.

Thyroid

D.

Cricoid

Answer and Explanation

The Correct Answer is A

A. Epiglottis: The epiglottis is a leaf-shaped flap of cartilage located at the root of the tongue. It covers the opening of the trachea during swallowing to prevent food and liquids from entering the airway. This function is crucial for protecting the respiratory tract from aspiration.

B. Arytenoids: The arytenoid cartilages are small, paired cartilages that are involved in the movement and tension of the vocal cords but do not cover the opening of the trachea.

C. Thyroid: The thyroid cartilage is the largest cartilage of the larynx and forms the Adam's apple but does not cover the trachea.

D. Cricoid: The cricoid cartilage is located below the thyroid cartilage and is the only complete ring of cartilage around the trachea. While it provides support, it does not cover the opening of the trachea.


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Related Questions

Correct Answer is D

Explanation

A. Seminal duct: There is no structure specifically called the "seminal duct" in male anatomy.

B. Epididymis: The epididymis is the tube where sperm mature, and it connects to the ductus deferens, not the urethra.

C. Prostatic duct: Prostatic ducts release prostatic fluid into the urethra, but they do not connect the ductus deferens to the urethra.

D. Ejaculatory duct: The ejaculatory duct connects the ductus deferens to the urethra, allowing sperm to enter the urethra for ejaculation.

Correct Answer is C

Explanation

A. It increases blood pressure, leading to a heart attack or stroke: This is not the primary mechanism of carbon monoxide poisoning.

B. It causes an increase in carbon dioxide, which causes an increase in pH: This is incorrect. Carbon monoxide binds to hemoglobin more tightly than oxygen, not carbon dioxide.

C. It occupies oxygen-binding sites on hemoglobin and decreases the amount of oxygen that reaches the tissues: Carbon monoxide has a high affinity for hemoglobin, leading to reduced oxygen transport in the blood, which can cause tissue hypoxia and death.

D. It causes inflammation within the bronchioles and prevents air from reaching the alveoli: This is incorrect; carbon monoxide poisoning does not work by causing inflammation.

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