Question

question 1 (2 points)
severe chest pain that occurs when the heart does not receive enough oxygen is called ____________.
a) myocardial infarction
b) pericarditis
c) angina pectoris
d) atherosclerosis
question 2 (2 points)
the ______ sends out an electrical impulse that begins and regulates the heartbeat.
a) sa node
b) purkinje fibers

Explanation:

For Question 1, angina pectoris is chest pain due to insufficient oxygen to the heart. Myocardial infarction is a heart - attack with heart - muscle death. Pericarditis is inflammation of the pericardium. Atherosclerosis is artery - hardening.
For Question 2, the SA (sino - atrial) node is the heart's natural pacemaker sending electrical impulses to start and regulate the heartbeat. Purkinje fibers conduct impulses for ventricular contraction.

Answer:

Question 1: c) angina pectoris
Question 2: a) SA node