The tricuspid valve shuts. This prevents blood from flowing backward into the right atrium while the ventricle contracts. So, your answer will be the Tricuslid Valve. Hope I helped!
Answer:
yes. a ecosystem consist of both biotic and abiotic factor
<span>The gland which signals other glands to secrete hormones is the pituitary gland.</span>
Answer:
C) the phrenic nerve that serves the diaphragm receives its fibers from here
Explanation:
