Question

The arteries have walls while veins have valves .explain

Answer 1

As the arteries transport blood pumped from heart which has very high pressure, so they need to have thick elastic walls.

But veins need valves to keep blood flowing in one direction and prevent backflowing or pooling as the flow is less constant.

Note:- Arteries do not need valves as they pump blood at higher pressure, which naturally prevents backflowing of blood.

Answer 2

Answer:

ᴀs ᴛʜᴇ ᴀʀᴛᴇʀɪᴇs ᴛʀᴀɴsᴘᴏʀᴛ ʙʟᴏᴏᴅ ᴡɪᴛʜ ᴠᴇʀʏ ʜɪɢʜ ᴘʀᴇssᴜʀᴇ ᴛʜᴇʏ ʜᴀᴠᴇ ᴛʜɪᴄᴋ ᴇʟᴀsᴛɪᴄ ᴡᴀʟʟs ᴛᴏ ᴡɪᴛʜsᴛᴀɴᴅ ᴛʜᴇ ᴘʀᴇssᴜʀᴇ. ʙʟᴏᴏᴅ ɪɴ ᴛʜᴇ ᴀʀᴛᴇʀɪᴇs ɪs ᴜɴᴅᴇʀ ʜɪɢʜ ᴘʀᴇssᴜʀᴇ ɢᴇɴᴇʀᴀᴛᴇᴅ ʙʏ ᴛʜᴇ ʜᴇᴀʀᴛ, sᴏ ᴀʀᴛᴇʀɪᴇs ʜᴀᴠᴇ ᴛʜɪᴄᴋ ᴡᴀʟʟs. ᴜɴʟɪᴋᴇ ᴀʀᴛᴇʀɪᴇs, ᴠᴇɪɴs ʜᴀᴠᴇ ᴏɴᴇ-ᴡᴀʏ ᴠᴀʟᴠᴇs ɪɴ ᴛʜᴇᴍ ᴛᴏ ᴋᴇᴇᴘ ᴛʜᴇ ʙʟᴏᴏᴅ ᴍᴏᴠɪɴɢ ɪɴ ᴛʜᴇ ᴄᴏʀʀᴇᴄᴛ ᴅɪʀᴇᴄᴛɪᴏɴ.