Quiz 6 in class

Question 1

Explain how the heart contracts

Answer 1

1. The SA node generates an action potential that travels to the neighboring cells(1/10 second) in the atrium to contract
2. Once the electrical signal reaches the av node it causes a 1/10 delay in order for the ventricles can fill with blood than contract.
3. The signal then moves along the bundle branches and purkinje fibers that is quick and creates a powerful contraction that crosses enough force to push the blood into the heart

Question 2

How blood moves

Answer 2

1. Blood from the body enters the right atrium