Atelectasis from the outside (tumor, lymph node, tubercle). Another cause is poor surfactant spreading during inspiration, causing the surface tension to be at its highest which tends to collapse smaller alveoli. Atelectasis may also occur during suction, as along with sputum, air is withdrawn from the lungs. There are several types of atelectasis according to their underlying mechanisms or the distribution of alveolar collapse; resorption, compression, microatelectasis and contraction atelectasis. Relaxation atelectasis (also called passive atelectasis) is when a pleural effusion or a pneumothorax disrupts the contact between the parietal and visceral pleurae. Risk factors associated with increased likelihood of the
The Part Played by Labour in the Transition from Ape to Man a dialectical relationship with the human body. Specifically, Engels emphasizes the importance of humans’ opposable thumbs and phonetically dynamic mouths, which enabled them to articulate complex forms of language over time. In that respect, the essay challenged the prevailing philosophy of Cartesian dualism, which drew a stark division between mind and body. Marx and Engels had both alluded to this notion in previous writings, for instance in their first collaborative work, "The Holy Family", in which they wrote, “Body, being, substance are but different terms for the same reality. It is impossible to separate thought from matter that thinks.” However,