Archive for the ‘For Everyone’ Category

Salt and Water

Posted: December 16, 2015 in For Everyone
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One feature of biology we see over and over again is the ability of water to follow salt.  If salt is moved from one place to another the water will follow it in order to ‘dilute it’.

The process of water moving from one place to another in order to dilute is known as Osmosis.

Anatomy and Physiology students will see this happening in the kidneys:  If the body is dehydrated, the hormone Aldosterone is released by the adrenal glands.  Aldosterone causes salt to move from the kidneys back into the blood-stream.
Water follows the salt from the kidneys back into the blood-stream, rather than ending up in the urine.  The dehydration is prevented from getting worse.

If you struggle to remember this concept of osmosis, remember what happens to the water in a slug if it comes across a pile of salt…

Melting slugPicture courtesy once again of the fabulously talented Sarah Mills


The Canine HeartRemembering the names of the valves of the heart can be difficult – especially trying to remember which valve goes on which side.
You may have heard names like Tricuspid Valve and Bicuspid Valve or even Mitral Valve.

There’s an easier way of naming the valves, however, where the names actually tell you about their position:
Between each Atrium and Ventricle is a valve, which is there to stop blood flowing in the wrong direction.  If you use the name Atrio-Ventricular Valve or A-V Valve, the name tells you that the valve is between the Atrium and Ventricle.  To make sure everyone knows which side you’re talking about, you should use the names Left Atrio-Ventricular Valve or Right Atrio-Ventricular Valve.

One of the main problems with diarrhoea is that it’s so bloomin’ difficult to spell.
If you have trouble remembering how to spell ‘Diarrhoea’, remember this handy phrase:

Dashing – In – ARush? – Really – Hurry – Or – Else – Accident.