3.When we feel drowsy and lazy we tend to yawn&Mention the significance
of it for our body?
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in order to gain more oxygen
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- yawning in humans is most likely vestigial and an evolutionarily ancient mechanism that has lost its significance. ... Still, low oxygen levels in the paraventricular nucleus (PVN) of the hypothalamus of the brain can induce yawning. Another hypothesis is that we yawn because we are tired or bored
- Temperature regulation might be why we yawn most often first thing in the morning and at the end of the day. Temperature changes in the body are an important part of transitioning between sleep and wakefulness. ... It's a common reaction, and scientists think it may be related to the cooling effect of yawning on the brain.
- Yawning helps to cool your brain down from that clotting. Another reason you may yawn is because the body wants to wake itself up. The motion helps stretch the lungs and their tissues, and it allows the body to flex its muscles and joints. It may also force blood toward your face and brain to increase alertness
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