7. As a rule, it’s not blood as a whole, but its products that are used for transfusion.
Perhaps, you have seen many episodes in movies and TV series where blood is directly transfused from one person to another with the help of a special device. In real life, this procedure is not performed anymore — today’s approach consists of component transfusion when it’s only blood products that are used. For example, plasma, leukocytes, erythrocytes, or platelet mass and other components.
8. A human has much more than 5 senses.
Apart from the main senses, humans have other senses as well. For example:
- The sense of balance – the ability to keep balance and a sense of body movement in terms of acceleration and change of direction.
- Proprioception, or the sense of space — the ability to spot different parts of your body relative to other body parts. This sense helps us go upstairs without looking at the stairs. People with bad proprioception can be clumsy.
- Stereognosis — the ability to recognize a subject by touch with closed eyes.
- 2-dimensional feeling — in order to understand how it works, close your eyes and ask someone to write something on your skin (not with a pen, of course, but with a fingertip). You’ll probably be able to understand what exactly was written on you or at least you’ll recognize separate letters.
- Muscle and joint senses help you stay aware of what position your legs and arms are in at the moment.
- The sense of localization helps to spot the place you are touched at.
- The sense of pressure determines the difference between a light touch and a heavy pressing.