Question

the deep seated blood vessels (the arteries) bulge on the side towards the heart when tied what do we und6erstand by this.

Answer 1

when it is tied the ordinary flow of blood is disturbed and the rate of flow is decreased
so heart has to give more pressure to the blood so that it keeps running
so more amount of blood reaches the arteries causing the bulge
in the case of being tired too the body needs more oxygen thus more blood has to reach there so blood pumps more blood faster to that region casing small bulging

Answer 2

Answer:

because arteries are the ones who flows towards the heart and they carry oxygenated blood

Explanation:

we understood that arteries takes blood towards the heart so they are bulging on the side towards the heart when tied