Mucous membrane partially or completely covering the vaginal orifice is called as:

Correct Answer: C

Rationale: The correct answer is C: Hymen. The hymen is a mucous membrane that partially or completely covers the vaginal orifice. It is a thin tissue located at the opening of the vagina. The hymen can vary in appearance and may partially cover the vaginal opening, making it an essential anatomical structure to consider. The other choices are incorrect because: A: Clitoris - The clitoris is a highly sensitive sexual organ located above the vaginal opening, not covering it. B: Labia - The labia are the folds of skin surrounding the vaginal opening, not covering it entirely. D: Vulva - The vulva refers to the external female genitalia, including the labia, clitoris, and vaginal opening, but it does not specifically refer to the mucous membrane covering the vaginal orifice.

Correct Answer: C

Rationale: The correct answer is C, Herpes. Herpes is a viral infection caused by the herpes simplex virus, not a bacterial infection. Chlamydial (A), Gonorrhea (B), and Syphilis (D) are all bacterial infections caused by specific bacteria. Therefore, Herpes does not fit the category of bacterial infections, making it the correct choice.

Correct Answer: B

Rationale: The correct answer is B: Fossa. A fossa is a hollow cavity or depression within a bone. It serves as an attachment site for muscles, ligaments, or tendons. Sulcus (A) is a groove or furrow, not a hollow cavity in a bone. Fissure (C) is a narrow opening or cleft, not a hollow cavity. Sinus (D) is a cavity within a bone filled with air, not necessarily hollow. Therefore, the best choice for a hollow cavity within a bone is a fossa.

Correct Answer: C

Rationale: The correct answer is C: 11, 12 ribs. Floating ribs are ribs that do not have a direct attachment to the sternum. Ribs 11 and 12 are considered floating ribs because they do not attach to the sternum or cartilage of other ribs, only to the vertebrae in the back. Choices A and B are incorrect because ribs 1-10 are not considered floating ribs. Choice D is incorrect because ribs 11 and 12 are indeed the floating ribs of the thoracic cage.

Correct Answer: C

Rationale: The correct answer is C: Shoulder joint. A ball and socket joint allows for multi-directional movement with a wide range of motion. The shoulder joint fits this description as it consists of the ball-shaped head of the humerus bone fitting into the socket of the scapula bone. This anatomical structure allows for movements like flexion, extension, abduction, adduction, and rotation. In contrast, the interphalangeal joint (A) is a hinge joint, the knee joint (B) is a hinge joint, and the elbow joint (D) is a pivot joint, none of which have the same range of motion as a ball and socket joint.