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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.

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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

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Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

The vocal cords within the larynx, superior view from the pharynx. The vocal cords within the larynx, superior view from the pharynx.
Endotracheal intubation. First, a lighted scope is used to identify the trachea from the esophagus. Endotracheal intubation. First, a lighted scope is used to identify the trachea from the esophagus.
Nose, nasal cavity, and pharynx: (A) nasal cartilages and external structure; (B) meatus and positio Nose, nasal cavity, and pharynx: (A) nasal cartilages and external structure; (B) meatus and positio
The respiratory system. (a) Sagittal section of the head and neck, revealing the organs of the upper The respiratory system. (a) Sagittal section of the head and neck, revealing the organs of the upper
Oral cavity and pharynx Oral cavity and pharynx
Days 24–25 Pharyngeal arches develop. They will contribute to the face, neck, larynx, and pharynx. Days 24–25 Pharyngeal arches develop. They will contribute to the face, neck, larynx, and pharynx.
Video: Types of antimicrobial substances (interferons & complement protein)

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