Answer:
the answer is theory
Explanation:
hope you have what you are looking for! Thx!
The main responsible for the delay among the atrial and
ventricular contractions is the action potential conduction velocity of the AV
node cells. If the atria and ventricles contract simultaneously, atria cannot
give any help in filling the ventricles, which is needed, especially in those
with stiff ventricles as in the elderly. Hence atria have to contract first and
then the ventricles.
Answer:
keratin
Your nails are made of keratin
Keratin is a type of protein that forms the cells that make up the tissue in nails and other parts of your body.
Explanation:
Usually you can change that if you go to bed at like maybe say 7:30pm or maybe even 8, sometimes if you do that then you won't be tired in the morning. Hope this helped, have a great day! :D
