Answer:
Pellagra: Vitamin B3
Scurvy: Vitamin C
Explanation:
Pellagra is a disease produced by low levels of Niacin (Vitamin B3). It can either happen because of malnutrition (Primary cause) or malabsorption (Secondary cause). The symptoms are known as the 3 D's: Diarrhea, Dementia, and Dermatitis. It is treated with dietary changes or dietary supplements.
Scurvy is a Vitamin C defficiency, it is treated with oral or IV vitamin C supplements. The symptoms include anemia, weakness, gum or skin problems. If it is left untreated it can be fatal.
The right answer is True
Reason:
AV nodal block (also known as "heart block"), occurs when conduction between the atria and the ventricles is impaired due to damage of the specialized conducting tissue.
Answer:
The most likely cause of the hearing change is a long exposure to high-frequency noise during a 4-hour flight.
Explanation:
The most common high-frequency sensorineural hearing loss is normally caused by noise exposure or aging, and often both. In this condition loud noises like a plane taking off or explosion damage the hair cells at the base of the cochlea.
The man experiencing tinnitus and hearing loss after the four-hour flight and as per the audiogram demonstration, the cause of the hearing change is most likely due to the exposure of the high-frequency sound or noise.
Thus, the correct answer is a long exposure to high-frequency noise during a 4-hour flight.
