Question

veins are thin walled and have valuse justify​

Answer 1

Veins are thin-walled and have valves that prevent the blood from flowing back in the wrong direction. Veins carry blood heading toward the heart. Blood coming from the tissues has delivered O2 and picked up CO2 from the cells.

Khadijah21

Answer 2

• ꜱᴏʟᴜᴛɪᴏɴ :

ᴠᴇɪɴꜱ ʜᴀᴠᴇ ᴛʜɪɴ ᴡᴀʟʟꜱ ʙᴇᴄᴀᴜꜱᴇ ᴛʜᴇ ʙʟᴏᴏᴅ ᴛʜᴇʀᴇ ɪꜱ ɴᴏ ʟᴏɴɢᴇʀ ᴜɴᴅᴇʀ ᴘʀᴇꜱꜱᴜʀᴇ ᴀɴᴅ ᴛʜᴇʏ ʜᴀᴠᴇ ᴠᴀʟᴠᴇꜱ ᴛᴏ ᴇɴꜱᴜʀᴇ ʙʟᴏᴏᴅ ꜰʟᴏᴡ ɪɴ ᴏɴᴇ ᴅɪʀᴇᴄᴛɪᴏɴ.

• ᴇxᴘʟᴀɪɴɪɴɢ :

ᴛʜᴇ ʙʟᴏᴏᴅ ꜰʟᴏᴡ ɪɴ ᴛʜᴇ ᴠᴇɪɴꜱ ɪꜱ ᴘᴀꜱꜱɪᴠᴇ ɪ.ᴇ ᴅᴏᴡɴ ᴀ ᴘʀᴇꜱꜱᴜʀᴇ ɢʀᴀᴅɪᴇɴᴛ ɪɴ ᴄᴏɴᴛʀᴀꜱᴛ ᴛᴏ ᴀʀᴛᴇʀɪᴀʟ ꜰʟᴏᴡ ᴡʜɪᴄʜ ᴏᴄᴄᴜʀꜱ ᴅᴜᴇ ᴛᴏ ᴛʜᴇ ᴘʀᴇꜱꜱᴜʀᴇ ɢᴇɴᴇʀᴀᴛᴇᴅ ᴛᴏ ᴛʜᴇ ᴘᴜᴍᴘɪɴɢ ᴀᴄᴛɪᴏɴ ᴏꜰ ᴛʜᴇ ʜᴇᴀʀᴛ ᴀɴᴅ ᴄᴀɴ ꜰʟᴏᴡ ᴀɢᴀɪɴꜱᴛ ᴀ ɢʀᴀᴅɪᴇɴᴛ. ꜱɪɴᴄᴇ ᴛʜᴇ ꜰʟᴏᴡ ɪꜱ ᴘᴀꜱꜱɪᴠᴇ ɪɴ ᴠᴇɪɴꜱ ᴛʜᴇ ᴘʀᴇꜱꜱᴜʀᴇ ᴡɪᴛʜɪɴ ᴛʜᴇ ᴠᴇɴᴏᴜꜱ ꜱʏꜱᴛᴇᴍ ɪꜱ ʟᴏᴡ ᴀɴᴅ ᴄᴏɴꜱᴇQᴜᴇɴᴛʟʏ ᴛʜᴇ ᴡᴀʟʟ ꜱᴛʀᴇꜱꜱ ɪɴ ᴛʜᴇ ᴠᴇɪɴꜱ ɪꜱ ʟᴇꜱꜱ .ᴛʜᴇʏ ᴀʀᴇ ᴛʜᴇʀᴇꜰᴏʀᴇ ᴛʜɪɴ ᴡᴀʟʟᴇᴅ.ᴡʜᴇɴ ᴛʜᴇʀᴇ ɪꜱ ᴀ ʟᴏᴡ ᴘʀᴇꜱꜱᴜʀᴇ ᴘᴀꜱꜱɪᴠᴇ ꜰʟᴏᴡ ꜰʀᴏᴍ ᴛʜᴇ ʟᴏᴡᴇʀ ᴘᴀʀᴛꜱ ᴏꜰ ᴛʜᴇ ʙᴏᴅʏ ɢʀᴀᴠɪᴛʏ ᴡᴏʀᴋꜱ ᴀɢᴀɪɴꜱᴛ ɪᴛ . ᴛʜᴇʀᴇꜰᴏʀᴇ ᴛᴏ ᴘʀᴇᴠᴇɴᴛ ᴛʜᴇ ʙʟᴏᴏᴅ ꜰʀᴏᴍ ꜰʟᴏᴡɪɴɢ ʙᴀᴄᴋᴡᴀʀᴅꜱ ᴠᴇɪɴꜱ ʜᴀᴠᴇ ᴠᴀʟᴠᴇꜱ ᴡʜɪᴄʜ ᴇɴꜱᴜʀᴇ ᴛʜᴀᴛ ᴛʜᴇ ʙʟᴏᴏᴅ ᴏɴʟʏ ꜰʟᴏᴡꜱ ꜰᴏʀᴡᴀʀᴅ.