Quiz

BuzzFeed Staff, UK 

BuzzFeed

<b>Unless you're studying it at degree level, of course.</b> Based on test questions from <a href="http://www.ocr.org.uk/qualifications/as-a-level-gce-human-biology-h023-h423/" target="_blank">A-Level Human Biology</a>.

Unless you're studying it at degree level, of course. Based on test questions from A-Level Human Biology.

The Hardest Quiz About Your Body You Will Ever Take

We start out with over 300 bones, but as we grow up some fuse together and we end up with 206.

How many bones does an adult human have?

And it's happening in your blood RIGHT NOW.

How does haemoglobin transport oxygen?

How many oxygen molecules can one haemoglobin molecule carry?

Here's a [handy song](https://www.youtube.com/watch?v=KnJkMfmea28) that will help you remember what it does.

Which part of your brain regulates sleep?

Bodily fluids contain water because it's an ideal transport medium.

Complete the sentence: "A water molecule has an uneven distribution of charge, so it is said to be \_\_\_\_."

Which of these is an electrolyte found in blood plasma?

The endothelium is a thin layer of cells on the inside of veins and arteries.

A vein is made up of different tissues. What sort of tissue is labelled "a" on the below diagram?

In the above diagram, what does the part labelled "b" do?

There are elastic fibres in a vein, but they're the layer above the endothelium.

In the above diagram, what sort of fibres are "c"?

Adenine pairs with thymine, and cytosine pairs with guanine.

Which of these is a base pair?

It's lumen. The serosa is a fluid-secreting membrane that covers some of your organs.

What's the name of the space inside a tubular structure, like a vein or bronchiole? 

The muscles in the bronchioles actually contract, restricting the amount of air that can pass through bronchioles in the lungs.

Which of these happens in the lungs when someone has an asthma attack?

Diploid cells have the full number of chromosomes. Gametes are haploid cells, and they have half the number of chromosomes as usual.

The simplified diagram below shows meiosis, during which cells divide to form gametes. What type of cell is labelled "a"?

FAD (flavin adenine dinucleotide) molecules live in mitochondria, but they're in the matrix.

Which molecule sits on the inner membrane of mitochondria?

Nerve impulses are caused by the change in concentration of what?

It's the largest organelle and was one of the first to be discovered. It's present in eucaryotic cells.

What does the Golgi apparatus in your cells do?

Glycogen is a polysaccaride of glucose. It provides long-term energy storage and is stored mostly in your liver and muscles. A hexose sugar is a monosaccharide with just six carbon atoms.

Which of these does NOT apply to energy-storing molecule glycogen?

It's [86 billion](http://www.frontiersin.org/human_neuroscience/10.3389/neuro.09.031.2009/full). So many.

How many neurons are there in the average brain?

Not great! You could do with brushing up a bit.

Pretty good! You've obviously been revising.

Amazing! You know your insides inside-out. Congratulations.

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The Hardest Quiz About Your Body You Will Ever Take

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The Hardest Quiz About Your Body You Will Ever Take

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