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The tubular structure of the uterus that projects a short distance into the vagina is called the_

A.

Cervix

B.

Perimetrium

C.

Vestibule

D.

External os

Answer and Explanation

The Correct Answer is A

A. Cervix: The narrow, tubular, inferior portion (“neck”) of the uterus that protrudes into the vagina; it contains the external os.

B. Perimetrium: The outer serosal covering of the uterus (visceral peritoneum); not a tube and doesn’t project into the vagina.

C. Vestibule: The external genital space between the labia minora with the urethral and vaginal openings; not part of the uterus.

D. External os: Merely the opening of the cervix into the vagina—not the entire projecting tubular structure.


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Related Questions

Correct Answer is A

Explanation

A. Apnea:Apnea is the temporary cessation (absence) of breathing.
B. Dyspnea: Dyspnea means difficult or labored breathing (shortness of breath), not cessation.
C. Hyperpnea: Hyperpnea refers to increased depth and/or rate of breathing (e.g., during exercise), not a pause.
D. Eupnea: Eupnea is normal, unlabored breathing; the opposite of cessation

Correct Answer is B

Explanation

A. Chief cells: Chief (zymogenic) cells secrete pepsinogen (precursor to pepsin) and some gastric lipase -not HCl or intrinsic factor.
B. Parietal cells: Parietal cells (oxyntic cells) secrete hydrochloric acid (HCl) and intrinsic factor (necessary for B12 absorption).
C. Mucous neck cells: Mucous neck cells produce mucus (and some protective secretions) to protect the stomach lining -not HCl/intrinsic factor.
D. Enteroendocrine cells: Enteroendocrine cells release hormones (e.g., gastrin, somatostatin) that regulate digestion -do not secrete HCl or intrinsic factor directly.

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