A heart beat, breathing, and moving ;)
well, there are a few meanings...
1. the area of variation between upper and lower limits on a particular scale.
2. a set of different things of the same general type.
What we see can send panic signals to our endocrine system and then have an effect on systems from there. and also if we see something we are scared of it can stop our breathing, make us scream, close our eyes and other things.
Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.
Answer:
the oxygen concentration decreases only when the air reaches the alveoli, which are the terminal branches of the respiratory system
Explanation:
The human respiratory system is responsible for taking in oxygen-rich air, and they expelling oxygen-poor air. The respiratory system consists of lungs, which helps in the exchange of gases: Oxygen and carbon dioxide.
The statement ''the oxygen concentration decreases only when the air reaches the alveoli, which are the terminal branches of the respiratory system'' explains the change in oxygen concentration of the inspired air
