Answer:
The skull protects the brain from any direct damage and the vertebrae helps keep the nerves in the spine in place and protected from damage. So the central nervous system is protected by the vertebrae and the skull.
The answer to your asked question is c. have a good day!
Answer
Cortisol
Explanation:
Cortisol or stress hormone is a steroid hormone produced in the adrenal gland( Cortex) .A spike in the levels of this hormone suppresses Serotonin levels in the blood. Serotonin is a neuro- transmitter in the brain for mood regulation and balance of memory., good sleep sexual function.
A spike in the levels in the cortisol level in the blood brings a corresponding decrease in the levels of Serotonin,which therefore leads to mood swings depression and insomnia,anxiety by reducing the receptors for serotonin,and therefore disrupting Endorphins levels in the brain.
Exercises decreases the levels of cortisol in the blood,and boost the levels of serotonin therefore boosting the amount of serotonin in the blood ,thus promoting good mood, reduce depression etc
Answer:
It is brought into the lungs when the healthy person is inhaling, once they exhale some oxygen is let out.
Explanation:
I'm not very sure what you were asking I hope this helped.
