D. Estuaries
Estuaries are a place where fresh and salt water mix.
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.
Some strategies can be outlining concepts, role playing, games,
Trachea
Tongue
A slight head tilt
Answer:
The nervous system is the part of an animal's body that coordinates its behavior and transmits signals between different body areas.
