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.
Answer:
Place the heel of your hand on the center of the person's chest, then place the other hand on top and press down by 5 to 6cm (2 to 2.5 inches) at a steady rate of 100 to 120 compressions a minute. After every 30 chest compressions, give 2 rescue breaths.
Explanation:
Jellyfish have glowing protein as well as fireflies, corals, species of fish and certain species of frogs. Basically any animal or plant you see in nature that produces its own fluorescent light.
Answer: a. too much acetylcholine staying in the neuromuscular junction for too long
Explanation:
Sarin is a gaseous organophosphate. This gas is used for chemical warfare. This affects the nervous system of the body. The gas if inhaled can cause death within minutes.
Acetylcholine is a neurotransmitter molecule. It is released from the pre-synaptic neurons that binds to the acetylcholine receptors.
The gas sarin will target the enzyme acetylcholinesterase present in the neuromuscular junction of the body where the nerves actually meet the muscles. The enzyme degrades nerve signaling molecule acetylcholine. Thus when the sarin degrades the enzyme the levels of acetylcholine will rise up in the blood. The acetylcholine remain in the neuromuscular junction. The acetylcholine will stimulate the nerve cell receptors. Excess of acetylcholine will cause excessive twitching and may lead to paralysis.
Answer:
D. Calcitonin
Explanation:
C-cells are also called parafollicular cells, these cells are located adjacent to the thyroid follicles. These cells work as antagonist cells of the Vitamine D and the parathyroid hormone. The parafollicular cells are stimulated by high serum levels of calcium. The higher the calcium levels are they start to release the calcitonin.
