Which of the following is a structure that protects the airway during the process of swallowing?
Trachea
Epiglottis
Uvula
Pharynx
The Correct Answer is B
A. The trachea is the windpipe that carries air to the lungs. While it plays a role in respiration, it does not protect the airway during swallowing.
B. The epiglottis is a flap of cartilage that covers the trachea during swallowing, preventing food or liquid from entering the airway and directing it to the esophagus.
C. The uvula is part of the soft palate that helps in the swallowing process but does not directly protect the airway. It assists in preventing food from entering the nasal cavity.
D. The pharynx is the passageway for both air and food, but it does not provide protection to the airway during swallowing. The epiglottis is the main structure responsible for this protection.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Dense regular connective tissue consists of fibroblasts arranged tightly between parallel arrays of collagen fibers. This structure provides tensile strength in one direction, which is found in tendons and ligaments.
B. Dense irregular connective tissue also contains collagen fibers, but these fibers are arranged in an irregular, non-parallel pattern, allowing the tissue to withstand tension from multiple directions, such as in the dermis of the skin.
C. Elastic connective tissue contains a higher proportion of elastin fibers, which provide stretch and recoil. It is found in structures like the walls of large arteries, but not in parallel arrays of collagen fibers.
D. Reticular connective tissue consists of a network of thin, branching collagen fibers, providing structural support in organs like the spleen and lymph nodes, but it does not have tightly packed fibroblasts between parallel collagen fibers.
Correct Answer is A
Explanation
A. The plasma membrane, also known as the cell membrane, surrounds the cell and encloses the cytoplasm. It acts as a barrier, controlling the movement of substances in and out of the cell.
B. The Golgi apparatus is an organelle that modifies, sorts, and packages proteins and lipids for transport, but it does not enclose the cytoplasm.
C. The endoplasmic reticulum is involved in the synthesis of proteins and lipids within the cell but does not enclose the cytoplasm.
D. The flagellum is a tail-like structure that helps some cells move but does not enclose the cytoplasm.
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