Answer:
If all the pulmonary alveoli were damaged, the function of the respiratory system, consisting of breathing so that gas exchange occurs, would not be possible.
Explanation:
The pulmonary alveoli are the functional units of the respiratory system, since in them occurs the exchange of O₂ and CO₂ that guarantees life. These structures are located at the end of the bronchial tree, and there the inspired air arrives, besides containing the air that will be exhaled.
If the pulmonary alveoli were damaged, the respiratory function - and the gas exchange - could not occur, which would negatively impact the function of the respiratory system.
The area was once covered by sea, mountains, deserts, and coastal plains.
Answer:
That is a trochophore larva
Explanation:
Answer:
a skin
Explanation:
Mechanical barriers physically block pathogens from entering the body. The skin is the most important mechanical barrier. In fact, it is the single most important defense that the body has against pathogens
Viruses may enter a host cell either with or without the viral capsid. The nucleic acid of bacteriophages enters the host cell “naked,” leaving the capsid outside the cell. ... Some enveloped viruses enter the cell when the viral envelope fuses directly with the cell membrane.