Untreated acute allergic reaction is a life-threatening situation because its symptoms can progress quickly. The most dangerous is the Anaphylaxis. It can be triggered by drugs, food, or injections, which a person may experience itching, swelling, difficulty in breathing, panic, and collapse. The worse is cardiac arrest when not treated immediately. Moreover, a prolonged illness may also develop as its late phase such as severe asthma.
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They release CO2 (just like us, when we breathe). But, when plants are photosynthesizing. They release the oxygen through the same pores that allow the CO2 to enter their leaf cells.
Macrophages as they are versatile cells which reside in the tissue
