The MAIN function of surfactant factor is to

Correct Answer: A

Rationale: The correct answer is A: Prevent alveoli of the lungs from collapsing. Surfactant reduces surface tension in the alveoli, preventing them from collapsing during exhalation and maintaining lung compliance. B, C, and D are incorrect because surfactant primarily affects lung mechanics, not the initiation of breathing, maturity of the respiratory center, or immediate regulation of breathing upon birth.

Correct Answer: C

Rationale: The correct answer is C: Very low birth weight neonate. This designation is given to infants whose birth weight is less than 1500 grams. In this case, the neonate's weight of 1201 grams falls within the criteria for very low birth weight. Choice A is incorrect because being genetically small does not necessarily equate to low birth weight. Choice B is incorrect as low birth weight typically refers to infants weighing between 1500-2499 grams. Choice D is incorrect as extremely low birth weight pertains to infants weighing less than 1000 grams.

Correct Answer: B

Rationale: In uterine inversion, the fundus is the last part to be replaced due to its position being the deepest inside the vagina. The fundus is the upper portion of the uterus and is the last part to invert back into its normal position. The cervix, isthmus, and body are parts of the uterus that are more easily replaced during the process of uterine inversion. The fundus being the final part to be replaced ensures the uterus is fully restored to its correct orientation.

Correct Answer: D

Rationale: Rationale: 1. Hypoplastic left heart syndrome involves underdevelopment of the left ventricle, aortic valve, and aortic arch. 2. The left ventricle is essential for pumping oxygenated blood to the body. 3. Aortic valve controls blood flow from the left ventricle to the aorta. 4. Aortic arch connects the ascending and descending aorta. Summary: A - Incorrect, as it includes pulmonary veins not related to hypoplastic left heart syndrome. B - Incorrect, as it includes structures not primarily affected in this condition. C - Incorrect, as it does not involve structures related to the left side of the heart.

Correct Answer: A

Rationale: The correct answer is A: Inspiration. Laryngeal stridor is caused by narrowed or obstructed airway, resulting in noisy breathing. During inspiration, the air is drawn through the narrowed larynx, causing the stridor sound. During expiration, the air is leaving the body, so the noise may not be as prominent. Choices C and D, feeding and play, are unrelated to the respiratory process and do not affect the presence of laryngeal stridor.