3020 Lecture 22
Amber Stokes・2 minutes read
The sinoatrial node initiates depolarization in the heart, spreading the signal through the atria to the ventricles via the AV node and bundle branches, leading to a coordinated contraction. The immune system has innate and adaptive components working together, with barriers and cells like macrophages providing rapid defense against pathogens, while antibodies offer long-term protection.
Insights
- The heart's electrical system starts with the sinoatrial node, which triggers atrial depolarization and signals the atrioventricular node to continue the process, leading to coordinated atrial and ventricular contractions.
- The immune system consists of innate and adaptive immunity, with the former providing rapid, general defense mechanisms like phagocytes and complement proteins, while the latter offers specific, long-term protection via antibodies produced after exposure to pathogens.
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Recent questions
How does the heart initiate contractions?
The sinoatrial node initiates depolarization in the heart, spreading through both atria.
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