The second statement best explains the type of blood vessel and the function of these vessels' valves - <span>These are veins, which prevent the backflow of blood because the walls have little muscle to pump blood back to the heart.
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Veins are large blood vessels which carry blood back to the heart. <span>Veins have a system of valves to prevent back-flow.</span>
Answer:
More kids are not participating due to financial reasons than health issues.
Answer:
WARM UPS-
1. can prevent you from getting hurt of pulling a muscle
2.can help you mentally prepare
3.can help you with your breathing
Explanation:
COOL-DOWNS
1. your muscle can get cramped more easy
2.gets your heart rate to normal
3. makes you feel more refreashed that tired
Answer:
the body would usually fight both the vaccine (while the vaccine is also fighting the virus)and bacteria in body
B. cholesterol is a steroid
