An elderly patient in a nursing home has recurrent episodesof fainting when he stands. An alert nurse notes that this occursonly when his room is fairly warm; on cold mornings, he has nodifficulty.

What is the cause of the fainting, and how does itrelate to the autonomic nervous system and to roomtemperature?

An elderly patient in a nursing home has recurrent episodesof fainting when he stands. An alert nurse notes that this occursonly when his room is fairly warm; on cold mornings, he has nodifficulty. What is the cause of the fainting, and how does itrelate to the autonomic nervous system and to roomtemperature?