Heart Models: Artificial vs Human
How does an artificial heart model function compared to a human heart?
Describe the steps of blood flow through the human heart.
Answer:
1. Electrical signal travels toward the heart
2. Signal received by the nodes in the atrium
3. The atria contract
4. Signal received by the atrioventricular node
5. Signal transferred to the ventricles
6. The ventricles contract
Explanation:
The steps describing how blood flows through the human heart are as follows:
- Electrical signal travels toward the heart: The autonomic nervous system conducts the nerve impulse to the heart.
- Signal received by the nodes in the atrium: The atrial node located in the right atrium receives the nerve impulse and transmits it to the ventricular atrial node.
- The atria contract: Contraction of the atria drives blood to the ventricles and opens the atrioventricular valves.
- Signal received by the atrioventricular node: This node in the interventricular septum distributes the impulse to the His-Purkinje system.
- Signal transferred to the ventricles: The nerve signal passes through the His bundle, branches, and Purkinje fibers in both ventricles.
- The ventricles contract: Ventricular contraction empties the cavities, sending blood to the lungs and general circulation.
These sequential steps ensure coordinated events within the heart for efficient blood flow.