Tutor profile: Esha S.
Describe the pathway involved in the electric conduction of the heart.
In the heart the electric signal initiates at the SA node, located in the right atrium. The signal then reaches the AV node that is located in the middle of the atria and the ventricles. This is then transferred to the bundle of His and then to the Purkinje fibers.
What reactions does the sympathetic nervous system cause in relation to the parasympathetic nervous system?
The sympathetic nervous system is responsible for the fight-or-flight response in response to a stressful situation. This response may consist of increased heart rate, slowing of digestive systems, and dilation of the eyes. On the other hand, the parasympathetic response is often referred to as the rest-and-digest stage. This involves the slowing of your heart rate, constriction of bronchi, and promoting urinary function.
What are some differences between a prokaryotic cell and a eukaryotic cell?
A eukaryotic cell is definitely larger than a prokaryotic cell. Both prokaryotic and eukaryotic cells contain DNA and ribosomes. There are however significant differences. A eukaryotic cell contains membrane bound organelles. This includes the nucleus, golgi apparatus, endoplasmic reticulum, and mitochondira. These organelles are not present in a prokaryote. A prokaryotic cell contains a cell wall that is non-existent in an eukaryotic cell.
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