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Exercise, such as running, increases muscle activity. This increases the energy demand of these tissues, which increases the rate of cellular respiration. Respiration releases heat as a by-product, …

When cold or in shock a person's blood vessels constrict in order to preserve heat or to move blood flow to protect vital organs. I am interested in the mechanism by which this is achieved. Does thi …

Cutis anserina (goosebumps) are caused when the sympathetic nervous system induces the arrectores pilorum muscles at the base of each hair cell to contract and raise up the hair. Zoidberg has posted …

Humans are are upright in their anatomical position - fig. 1 - from which all directions and terminology stems. Figure 1: Anatomical Position Because of this, anterior is normally the same direct …

In the situation you describe, the eye would be focused on the distant mountain. This would mean that the lens would be stretched and thin in order to minimize the focussing power of the eye. Theref …

I'll point you to this article by A. Tuiten et al. To quickly answer your question, yes, testosterone does have an enhancing effect on the sexual behaviour of human healthy adult females. The (admi …

A Study by Lee & Shirreffs addresses this question. Unfortunately I only have the abstract, but it's enough to summarise from: Method Three groups exercised by cycling before being given water at …

Not entirely on your question but I think sufficiently relevant: This paper (freely available) identified a non-causal link between ejaculatory frequency and incidence of prostate cancer. Men w …

One of the important pigments that the earlier answer hinted at is melanin. Melanin is a brown pigment with photoprotectant properties. As you correctly identified in your question, exposure to EM …

Alongside full guidance released by NICE they also produce treatment pathways which give further advice - here is the treatment pathway for hypertension. You've listed most of the investigations that …

Salt water may have anti-septic properties due to the effect it has on water potential. Pure water has a water potential (Ψ) of zero. A concentrated salt solution has a lower (more-negative) water p …

This information is all strictly for Entonox - a brand of analgesic gas comprising 50% Oxygen (O2) and 50% Nitrous Oxide (N2O), Laughing Gas. This mixture is known as 'Gas and Air' and is in very com …

I'm sure that everyone is familiar with the sensation commonly known as "butterflies in the stomach". It is commonly experienced during periods of anxiety or stress (e.g. before high stakes job inter …

I'm rather ashamed to say that this question is partly based on an episode of House. I have previously heard that, if there are multiple simultaneous painful stimuli, the mind will only feel the sens …

Humans do not produce Vitamin C due to a mutation in the GULO (gulonolactone oxidase) gene, which results in the inability to synthesize the protein. Normal GULO is an enzyme that catalyses the react …