Hangovers – Electrolytes

Last week, we talked about what a hangover is, what its symptoms are and why hangovers cause headaches. This week, we’ll take a brief look at the importance of electrolytes in relation to hangovers.

A little recap

A little while ago, we talked about how alcohol inhibits a hormone called the antidiuretic hormone, which is the hormone that allows the body to reabsorb water from our kidneys before the kidneys send the final solution to our bladders for release. With this inhibition, not only is there not enough water reabsorbed but, because this hormone is inhibited, we urinate frequently under the influence of alcohol.

Now where do electrolytes fit in?

As a result of this frequent urination, we lose more than just water from our bodies. In addition to water, we lost electrolytes like sodium and potassium.

These electrolytes are important for several processes in our bodies, including nerve and muscle functions. When you lose a lot of electrolytes, your nerve and muscle functions are weaker as they require the electrolytes to help propagate signals. This is why you feel tired the morning after a rowdy night.

The absence of electrolytes also leaves you feeling nauseous and with an awful headache because of how dehydrated you are.

Help me, what can I do?

There was a post I did a million years ago (it was last July) where I talked a bit about electrolytes. Here’s the deal with them: where electrolytes go, water goes. So it’s time to power up with some electrolytes because the more electrolytes there are in your body, the better your body will retain water and the easier it will be to rehydrate! So grab some sports drinks, make sure it has some potassium in it, and rehydrate! You’ll feel like a normal being soon enough 🙂

The Urinary System – Selective Reabsorption

Last week, we learned about the general filtration process that occurs in our kidneys. This week, we’ll learn just how our kidneys modify the filtrate to produce urine.

The filtrate that is in the renal tubule consists of water as well as other small molecules, like sugars and urea. Some of these molecules, like sugars, can return to the bloodstream in a ‘process’ known as selective reabsorption. It’s called ‘selective’ reabsorption because the bloodstream is picky as to what it absorbs from the tubule. The molecules that leave the tubule enter tiny blood vessels next to the tubule, which are called peritubular capillaries. The molecules can then be carried through the rest of the circulatory system, to provide our body cells with nutrients (if they’re sugars).

Parts of the Kidney

Selective reabsorption mainly occurs in the proximal tubule, which is the beginning of the tubule. The proximal tubule is just after the Bowman’s capsule. Whenever a molecule leaves, it is accompanies by water, which means a lot of water is reabsorbed by the bloodstream in this process.

By returning the molecules to the bloodstream, the remaining filtrate’s composition changes. As water leaves, the concentration of particles in the tubule increases.

Hormones can affect what is reabsorbed in the distal tubule. These hormones are the anitidiuretic hormone (ADH), which is also known as vasopressin, and aldosterone. They’ll be discussed next week when we talk about Concentration and Dilution!

The Urinary System – Filtration

Last week, we talked about the basics of the urinary system, including the organs involved. This week, let’s take a closer look at what happens in the kidney, starting with filtration. The posts will be segmented because there will be a lot of new terms coming your way, and I would hate for you to get overwhelmed! So let’s learn how our bodies makes our pee, step by step.

Parts of the kidney

The basic functional unit within the kidneys is known as the nephron. This consists of all of the numbered portions, starting at the glomerulus (5) and ending at the distal tubule (6). 

The main components involved in filtration are the arteries, and the glomerulus.

Filtration

It is at the Bowman’s capsule where the filtration of blood occurs. The blood from the renal artery (renal means ‘kidney’) flows into a smaller version of an artery, known as the afferent arteriole. The name sounds weird, but ‘afferent’ basically means ‘towards something’. So this arteriole is moving blood towards the glomerulus. So this arteriole can also be referred to as the afferent glomerular arteriole.

The afferent arteriole then branches to form tiny blood vessels known as capillaries. These capillaries form a ball-like structure, which is part of the glomerulus (5). The capillaries are therefore called the glomerular capillaries.

The blood from the capillaries continues to flow into the next vessel, which is another arteriole, named the efferent arteriole. ‘Efferent’ means ‘away from something’, so the blood is moving away from the glomerulus. So this arteriole can also be referred to as the efferent glomerular arteriole.

This movement of the blood increases the amount of pressure within the capillaries, causing fluids to leak out. These fluids pass through a filter-like membrane, known as the glomerular basement membrane. Some substances are too large to pass through the basement membrane and, therefore, continue to circulate through the bloodstream.

The filtrate that goes through the glomerular basement membrane enters the Bowman’s capsule. The space inside the Bowman’s capsule is continuous with the rest of the tubule, which includes the proximal tubule, the loop of Henle and the distal tubule. The filtrate is concentrated and modified within these components of the tubule, which will be discussed next week.

And that is, thankfully, all there is to the filtration process for the urinary system! Next week, we’ll learn about what happens to the filtrate in the tubule.

The Urinary System – Basics

Before we can talk about how alcohol affects your urinary system, it’s important to understand the urinary system and how it usually works first. This will be a pretty general overview, though I will also provide a molecular overview of the system next week!

So let’s start learning about how urine is made!

The Urine Pathway

The organs involved in your urinary system:

  • Liver – synthesizes urea and releases it into the blood
  • Kidneys – filters the blood for urea, sodium, bicarbonate and water. If they are high levels of any of them, the kidneys will divert them from the bloodstream, and produces urine.
  • Bladder – the products of urine move from the kidney to your bladder, then to the urethra to be released.

The bladder actually has two muscles that control the release of urine: the internal and external sphincter. The internal sphincter relaxes on its own accord, thanks to your sympathetic nervous system. It is the external sphincter that helps you control whether you pee your pants or not.

And those are the basics of the urinary system! Next week, we’ll be looking at the detailed pathway (for you keeners (: ).