Answer:
Both the respiratory and circulatory systems works in coordination in order to purify the blood.The heart continuously pumps blood and the lungs at alveolar sacs the CO2 and O2 get exchanged.Continuously through the diffusion.
From body parts the blood reaches at heart through Vena cava To right atrium,then from Right ventricle through pulmonary artery it reaches to lungs and get purified.Form there it again comes back to heart through pulmonary vein and again through Aorta it again reaches to the body parts.
Hope it helps....
That statement is true
Our human brain is not designed to experience prolonged stress. In short term, stress does increase our adrenaline which help us became more alert and focused.
But prolonged exposure to it could cause some health risk such as increased blood pressure.
And by channeling our stress into coping strategies, it help us to manage it and decrease our adrenaline level
B) stimulant
Caffeine is usually not dangerous when used carefully. Depressants are a group of drugs that slow down the activity in the brain and body. and coffee helps you stay awake.
