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.
An absorptive heterotroph is an organism which secretes enzymes externally into its environment to digest organic materials which are then absorbed.
<u>Answer:</u>
<em>Public health informatics (phi) </em><em>fellowship is the study for the overall benefit of public health problems by the </em><em>application of knowledge of computer and technologies. </em>
<u>Explanation:</u>
After the study of the public health informatics (phi) fellowship the enrolled student will be able to assist the state and local health department to solve the complex health problems and public health challenges.
The nursing student would be able to use the science, technology and informatics to solve the growing need in the field of heath and sanitation.
