Human Body Systems And Human Body Interesting Facts
human body Amazing facts medical questions everybody wants to ask
the human body is the most complex organism we know and if humans tried to build one artificially, we’d fail abysmally. There’s more we don’t know about the body than we do know. This includes many of the quirks and seemingly useless traits that our species carry. However, not all of these traits are as bizarre as they may seem, and many have an evolutionary tale behind them. Asking these questions is only natural but most of us are too embarrassed or never get the opportunity – so here’s a chance to clear up all those niggling queries. We’ll take a head-to-toe tour of the quirks of human biology, looking at everything from tongue rolling and why we are ticklish through to pulled muscles and why we dream.
|Frontal lobe||The frontal lobe is where your personality is, and where your thoughts and emotions form. Removing this or damaging it can alter your persona.|
|Premotor cortex||The premotor cortex is where some of your movements are coordinated.|
|Primary motor cortex||The primary motor cortex and the primary somatosensory cortex are the areas which receive sensory innervations and then co-ordinate your whole range of movements.|
The parietal lobe is responsible for your complex sensory system.
|Primary auditory complex||The primary auditory complex is right next to the ear and is where you interpret sound waves into meaningful information.|
|Occipital lobe||The occipital lobe is all the way at the back, but it interprets the light signals in your eyes into shapes and patterns.|
|Wernicke’s area||Wernicke’s area is where you interpret the language you hear, and then you will form a response via Broca’s area.|
|Temporal lobe||The temporal lobe decides what to do with sound information and also combines it with visual data.|
|Broca’s area||Broca’s area is where you form complex words and speech patterns.|
2 In the mornings, do we wake up or open our eyes first?
Sleep is a gift from nature, which is more complex than you think. There are five stages of sleep which represent the increasing depths of sleep – when you’re suddenly wide awake and your eyes spring open, it’s often a natural awakening and you’re coming out of rapid eye movement (REM) sleep; you may well remember your dreams. If you’re coming out of a different phase, e g when your alarm clock goes off, it will take longer and you might not want to open your eyes straight away!
3 Do eyeballs grow like the rest of the body?
Only a small amount – this is actually why babies appear to be so beautiful, as their eyes are out of proportion and so appear bigger.
Although we’re often taught in school that tongue rolling is due to genes, the truth is likely to be more complex. There is likely to be an overlap of genetic factors and environmental influence. Studies on families and twins have shown that it simply cannot be a case of just genetic inheritance. Ask around – the fact that some people can learn to do it suggests that in at least some people it’s environmental (ie a learned behavior) rather than genetic (inborn).
When you feel your own pulse, you’re actually feeling the direct transmission of your heartbeat down your artery. You can only feel a pulse where you can compress an artery against a bone, e g the radial artery at the wrist. The carotid artery can be felt against the vertebral body, but beware, if press too hard and you can actually faint, press both at the same time and you’ll cut off the blood to your brain and, as a protective mechanism, you’ll definitely faint!
The tonsils are collections of lymphatic tissues which are thought to help fight off pathogens from the upper respiratory y tract. However, the tonsils themselves can sometimes even become infected – leading to tonsillitis. The ones you can see at the back of your throat are just part of the ring of tonsils. You won’t miss them if they’re taken out for recurrent infections as the rest of your immune system will compensate
Lips are predominantly used as a tactile sensor y organ, typically for eating, but also for pleasure when kissing. They are also used to help fine-tune our voices when we speak.
You’re actually hitting the ulnar nerve as it wraps around the bony prominence of the ‘humerus’ bone, leading to a ‘funny’ sensation. Although not so funny as the brain interprets this sudden trauma as pain to your forearm and fingers
Your total ‘circulating volume’ is about five liters. Each red blood cell within this has to go from your heart, down the motor way-like arteries, through the back-road capillary y system, and then back through the rush-hour veins to get back to your heart. The process typically takes about a minute. When you’re in a rush and your heart rate shoots up, the time reduces as the blood diverts from the less-important structures (eg large bowel) to the more essential (eg muscles).
1. The most important organ
The brain has its own special blood
supply arranged in a circle
2. Under pressure
Blood is moving fastest and under
the highest pressure as it leaves the
heart and enters the elastic aorta.
3. The inferior vena cava
These demands a massive 25 per cent of the blood from each heart beat
Onions make your eyes water due to their expulsion of an irritant gas once cut. This occurs as when an onion is cut with a knife, many of its internal cells are broken down, allowing enzymes to break down amino acid sulphoxides and generate sulphenic acids. These sulphenic acids are then rearranged by another enzyme and, as a direct consequence, syn-propanethial-S-oxide gas is produced, which is volatile This volatile gas then diffuses in the air surrounding the onion, eventually reaching the eyes of the cutter, where it proceeds to activate sensor y neurons and create a stinging sensation. As such, the eyes then follow protocol and generate tears from their tear glands in order to dilute and remove the irritant. Interestingly, the volatile gas generated by cutting onions can be largely mitigated by submerging the onion in water prior to or midway through cutting, with the liquid absorbing, much of the irritant.
blinking Help Keep your eyes clean and moist. Blinking spreads secretions from the tear glands (lacrimal fluids) over the surface of the eyeball, keeping it moist and also sweeping away small particles such as dust.
Simple’ male pattern baldness is due to a combination of genetic factors and hormones. The most implicated hormone is testosterone, which men have high levels of but women have low levels of, so they win (or lose?) in this particular hormone contest!
This is a behavioral response some people play with their hair when they’re nervous or bored. For the vast majority of people such traits are perfectly normal. If they begin to interfere with your life, behavioral psychologists can help but it’s extremely rare that you’ll end up there