Which of the following glands produces oil that lubricates hair follicles?

A. Cricoid cartilage: The cricoid cartilage is a ring-shaped structure located below the thyroid cartilage in the larynx. It provides support and maintains the airway but is not part of the glottis.

B. True vocal cords: The true vocal cords, or vocal folds, are part of the glottis. The glottis is the space between the vocal cords, and the vocal cords themselves are essential for sound production and phonation.

C. Thyroid cartilage: The thyroid cartilage is a large, shield-shaped cartilage in the larynx that forms the front of the laryngeal structure. It is not part of the glottis, though it surrounds the area where the vocal cords are located.

D. "Adam's apple": The "Adam's apple" is a colloquial term for the prominent part of the thyroid cartilage that is visible on the neck. It is not a structure within the glottis but rather an external feature of the larynx.

A. Ureters are fibrotic tubes connecting the kidneys to the urinary bladder: Ureters are not fibrotic; they are muscular tubes that propel urine from the kidneys to the urinary bladder through peristaltic contractions. The walls of the ureters are composed of smooth muscle, not fibrous tissue.

B. Ureters are covered by an outer layer of epithelial tissue: The ureters are lined internally by a transitional epithelium, but their outermost layer is not epithelial tissue. Instead, the outer layer of the ureters consists of connective tissue, which provides structure and protection.

C. Ureters are connected inside the urinary bladder by a two-way valve: The ureters enter the urinary bladder at an oblique angle, which forms a functional one-way valve, preventing the backflow of urine from the bladder into the ureters. This valve is not a true anatomical valve but rather a flap-like mechanism.

D. Ureters are extraperitoneal tubular structures: The ureters are indeed extraperitoneal, meaning they are located outside the peritoneal cavity. This positioning provides protection and ensures that the ureters are less likely to be involved in peritoneal infections or injuries. This statement accurately describes the anatomical location of the ureters.