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Nataly_w [17]
3 years ago
6

Ralph is looking at a blood vessel under a microscope as part of his study about the cardiovascular system. He notices that the

vessel contains blood and has valves. Determine the blood vessel being observed.
Biology
2 answers:
Ulleksa [173]3 years ago
7 0
Vein because they have valves to prevent back flow of blood.
Cloud [144]3 years ago
5 0
I think the correct answer for this would be the veins. Ralph is observing a vein since he notices  that the vessel contains blood and<span> which is the function of the veins - to carry blood around the body. Hope this answers the question. Have a nice day.</span>
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<u>During </u><u>latent </u><u>phase of a muscle twitch chemical changes such as the release of calicum are according intracelluary as rthe muscles prepare for contractrion.</u>

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