*140,23
The long, large vein you removed runs
up the middle of the abdomen, just
under the muscles.
>S(11),146,141
*141,23
It carries blood from the lower body to
the heart.
>S(11),146,142
*142,23
The ventral vein is part of the
circulatory system. Arteries carry
blood from the heart, delivering
oxygen.
>S(11),146,143
*143,23
Veins bring the used blood back.
>B(10),146,0
>E(11),146,144
*144,23
Most veins, such as the posterior vena
cava, carry deoxygenated blood.
>E(11),146,145
*145,23
The veins connecting the lungs to the
heart are an exception--they carry
oxygenated blood.
>E(10),146,0
*146,33
Human veins are a lot like frog veins,
only much longer and wider.
>S(01),0,147
*147,33
A human's largest veins are as wide as a
leopard frog's entire thigh.
>B(00),0,0
>E(01),0,148
*148,33
Most frog and human veins have valves
that prevent blood from flowing in the
wrong direction.
>E(01),0,149
*149,33
If, for example, blood starts flowing
back down a leg, the valves will shut
the vein.
>E(00),0,0
*1000