A&P DOL CARDIO UNIT 4

Which of the following is a unique characteristic of cardiac muscle tissue?

• It contracts with conscious effort.

• It is found in various organs throughout the body.

• It appears striped and is branched.

• It contains multiple nuclei.

What is the role of pacemaker cells in the heart?

• To control the activities of the cardiac muscle cells.

• To produce energy needed for muscle contractions.

• To respond to signals from the autonomic nervous system and regulate the heartbeat.

• To carry electrical impulses to each ventricle.

During which phase of the cardiac cycle do the ventricles contract and pump blood into the blood vessels?

• Diastole

• Systole

• Both diastole and systole

• Neither diastole nor systole

How does the electrical pathway of the heart ensure proper timing and synchronization of contractions?

• By controlling the activities of the cardiac muscle cells.

• By producing energy needed for muscle contractions.

• By responding to signals from the autonomic nervous system and regulating the heartbeat.

• By carrying electrical impulses to each ventricle.

What is the significance of the intercalated discs in cardiac muscle tissue?

• They allow for a wave-like pattern of contraction.

• They control the activities of the cardiac muscle cells.

• They produce energy needed for muscle contractions.

• They carry electrical impulses to each ventricle.