Physiology of the Large Intestine MCQ

True - one to three mass movements daily are expected. But, with all things, deviation from the mean does not necessarily warrant a pathological correlate.

The rectal mural (wall) surface must contract proximal to the faeces to assist in expulsion.

The left recurrent laryngeal nerve (RLN) loops under the aortic arch. The RLN innervates most muscles of the larynx, including those responsible for closing the vocal cords. An aortopulmonary window malignancy could impinge the left RLN, meaning the vocal cords can't close, limiting the body's ability to increase the abdominal pressure.

Urobilinogen is colourless, but can be oxidised to urobilin. This gives urine its yellow colour, and can contribute to the brown colour in faeces although this pigmentation is mainly from stercobilin.

Of course it is true!!! ≤3 per week is considered clinical constipation, from the latin “constipatio”, meaning “crowd together”.

Infectious causes of diarrhoea can exert their effects through multiple mechanisms including inflammation or, in the case of cholera, through secretion (a bacterial toxin triggers the movement of chloride ions into the gut lumen, drawing water in).

Oral rehydration therapy is a solution of sugar and table salt in water. The glucose in the sugar facilitates the transport of sodium into the body, which helps to draw water with it, so the patient does not become dehydrated.