Multiple Choice
Which organ system is primarily responsible for fighting off infections in the human body?
51
views
1. Introduction to Anatomy & Physiology
Introduction to Organ Systems
Struggling with Anatomy & Physiology?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following correctly labels the pathway for the cardiac conduction system?
A
Bundle of His → SA node → AV node → Purkinje fibers
B
Purkinje fibers → Bundle of His → SA node → AV node
C
Atrioventricular (AV) node → Sinoatrial (SA) node → Purkinje fibers → Bundle of His
D
Sinoatrial (SA) node → Atrioventricular (AV) node → Bundle of His → Purkinje fibers
Verified step by step guidance1
Step 1: Understand the cardiac conduction system, which is responsible for initiating and propagating electrical impulses that control the heartbeat.
Step 2: Learn the sequence of structures involved in the conduction pathway: the Sinoatrial (SA) node, Atrioventricular (AV) node, Bundle of His, and Purkinje fibers.
Step 3: Recognize the role of each structure: the SA node acts as the pacemaker, the AV node delays the impulse to allow ventricular filling, the Bundle of His transmits the impulse to the ventricles, and the Purkinje fibers distribute the impulse throughout the ventricular walls.
Step 4: Compare the given options to the correct sequence: Sinoatrial (SA) node → Atrioventricular (AV) node → Bundle of His → Purkinje fibers.
Step 5: Eliminate incorrect options by identifying deviations from the correct sequence and confirm the correct pathway based on the physiological roles of the structures.
2:29mWatch next
Master Introduction to Organ Systems with a bite sized video explanation from Bruce Bryan
Start learningRelated Videos
Related Practice
Introduction to Organ Systems practice set
Problem sets built by lead tutorsExpert video explanations