Give reasons.
a. Sleeping under a tree at night is not good for health.
b. We yawn when we are sleepy.
c. Our heart rate increases when we run.
Answers
Answer:
a. sleeping under a tree at night is not good for our health because trees in night give out carbon dioxide which is not good for our health. it leads to death.
b.This is yawn. Because our brain cells lack sufficient amount of oxygen The deep breath associated with yawning helps us to drawn in more oxygen and supply the much needed oxygen to the tired organs including the brain.
c.During running or exercise the bodys muscle increase their activity level and consume more oxygen. Thats why our heart rate increase when we run.
Explanation:
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Answer:
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Explanation:
a) In the night if you sleep under the tree, you will not get oxygen, which can cause breathing problem, suffocation etc.
b) When we are sleepy or feel drowsy, we yawn because our brain cells lack sufficient amount of oxygen.
c) When you are run your muscles need extra oxygen—some three times as much as resting muscles. This need means that your heart starts pumping faster, which makes for a quicker pulse.