Question

Bucco-pharyngeal cavity of the frog is lined by
a. Squamous epithelium
b. Cuboidal epithelium
c. Non-ciliated columnar epithelium
d. Ciliated columnar epithelium

Answer 1

Hint: Bucco-pharyngeal cavity of the frog is lined by ciliated, columnar epithelium which contains mucus-secreting glands.

Complete Answer:
Buccopharyngeal respiration takes place through the buccopharyngeal cavity. It lies in between the two jaws-the upper and the lower jaw. The upper jaw is fixed while the lower jaw is movable, i.e., it can move up and down in the vertical plane. It is lined by ciliated, columnar epithelium which contains mucus-secreting glands.

Option a: The squamous epithelium is a single layer or of flat layered cells. The function of squamous epithelium is that it gives permeability and it occurs where small molecules need to pass quickly through membranes via filtration or diffusion. Therefore, this is an incorrect option.

Option b: Cuboidal epithelium is made up of single-layer cells that are as tall as they are wide. Their important functions are secretion and absorption. Therefore, this is an incorrect option.

Option c: Ciliated columnar epithelium is a thin tissue that has hair-like structures on it. These hairs, called cilia, move back and forth to help move particles out of the body. Therefore, this is an incorrect option.

Option d: Buccopharyngeal cavity lined by ciliated, columnar epithelium which contains mucus-secreting glands. The ciliated columnar epithelium is composed of simple columnar epithelial cells with cilia on their apical surfaces. Ciliated columnar epithelium moves mucus and other substances via cilia and is found in the upper respiratory tract.

The buccal cavity of the frog consists of a moist mucous membrane and richly supplied with blood capillaries. It absorbs oxygen through diffusion. Hence, the buccal cavity of the frog is lined by ciliated columnar epithelium. Therefore, this is the correct option.

Thus, the correct option is d) Ciliated columnar epithelium.

Note: The buccal cavity consists of moist mucous membranes and are richly supplied with blood capillaries and it helps in the process of respiration.