How does stress affect your nerveous system

Anxiety can trigger your flight-or-fight stress response and release a flood of chemicals and hormones, like adrenaline, into your system. In the short term, this increases your pulse and breathing rate, so your brain can get more oxygen. This prepares you to respond appropriately to an intense situation

the aorta is the large artery leaving the heart branches into smaller arteries, which eventually branch into capillaries.the arteries carry oxygen and nutrients away from your heart, to your body's tissues. the capillaries are small, thin blood vessels that connect the arteries and the veins. the statement that arteries carry oxygen-rich blood to capillaries is true. veins on the other hand are blood vessels that take oxygen-poor blood back to the heart.