The American black bear lived during the same period as short-faced bears (Arctodus simus and A. pristinus) and the Florida spectacled bear (Tremarctos floridanus). These Tremarctine bears evolved from bears that had emigrated from Asia to North America 7â8 ma.
A plenum space is a part of a building that can facilitate air circulation for heating and air conditioning systems, by providing pathways for either heated/conditioned or return airflows, usually at greater than atmospheric pressure.
The parietal pleura, which lines the thoracic cavity, is an example of a serous membrane and the type of serous fluid it produces is known as pleural fluid. This helps the surfaces of the parietal and visceral pleurae to glide over one another when the lungs expand and relax during respiration.arietal pleura refers to a membrane that lines the chest cavity that contains the lungs. Traumatic injuries, such as a stab wound, may cause air in the pleural space, leading to an open pneumothorax. Pneumonia may cause the pleural space to become inflamed, which may lead to a condition known as pleurisy.