<em>Hi,</em>
<em>Which practice contributes the most to land pollution?</em>
O A disposal of industrial wastes and household garbage
The alimentary canal is made up of which of the following? (Select all that apply.)
small intestine
large intestine
pharynx
oral cavity (or mouth)
esophagus
stomach
The SA Node is the heart's normal pacemaker. When the SA Node depolarizes, electrical signal spreads through the atrial muscle causing contraction.
Explanation:
Inherent rhythmicity / automaticity - The property of the pacemaker cells of the heart to start electrical sequence of depolarization and repolarization.
SA Node or Sino-atrial Node generates the electrical signal.
The electrical signal passes through internodal pathways, atrial fibres, atrioventricular node (AV Node), the bundle of His, Purkinje fibres, right bundle branch, left bundle branch.
Systole - Contraction of cells when the electrical signal of depolarization reaches the contractile cells.
Diastole - Relaxation of cells when the electrical signal of repolarization reaches the myocardial cells.
<span>This is a sign of the primary stage of syphilis. These lesions, or chancres, will show up in the exact spot that the bacteria originally entered the body. This is generally a sign of the infection. The illness often incubates for long periods of time, from between ten and ninety days, so it could be months from the original contact.</span>
