Lesson Worksheet: The Regulation of a Heartbeat Biology
In this worksheet, we will practice describing the electrical regulation of a heartbeat and recalling what is meant by systole and diastole.
Q1:
When a heartbeat is initiated, a wave of electrical activity spreads out from the sinoatrial node. Where does it first spread to?
- AThe aorta and vena cava
- BThe ventricles
- CThe atria
- DThe Purkinje fibers
Q2:
Where in the heart are the Purkinje (or Purkyně) fibers located?
- AIn the walls of the ventricles
- BIn the lumen of the veins
- CIn the sinoatrial node
- DIn the walls of the atria
Q3:
Starting with an electrical impulse being generated in the sinoatrial node, which of the following outlines the passage of electrical impulses in the cardiac cycle in the correct order?
- ASAN bundle of His Purkinje fibers AVN
- BSAN Purkinje fibers AVN bundle of His
- CSAN AVN Purkinje fibers bundle of His
- DSAN bundle of His AVN Purkinje fibers
- ESAN AVN bundle of His Purkinje fibers
Q4:
Where in the heart is the sinoatrial node located?
- AIn the wall of the right atrium
- BIn the center of the septum
- CIn the entrance to the aorta
- DIn the wall of the left ventricle
Q5:
The cardiac cycle has two distinct phases, systole and diastole.
Complete the statement: The systole phase occurs when the ventricles and close the atrioventricular valves.
- Arelax
- Bcontract
Q6:
What is a typical resting heart rate of a healthy, adult human?
- A120 bpm
- B70 bpm
- C40 bpm
- D6 bpm
Q7:
The flowchart provided outlines the basic process of electrical activity that generates a heartbeat.
Which word would correctly replace the gap in statement 1?
- AAtrioventricular
- BPurkinje
- CCardiac
- DSinoatrial
Which word would correctly replace the gap in statement 3?
- APurkinje
- BCardiac
- CSinoatrial
- DAtrioventricular
Q8:
A single heartbeat has two distinct phases, one of ventricular contraction and one of ventricular relaxation. What are these phases called?
- AInhalation and exhalation
- BSystole and diastole
- CSino and atrio
- DInterval and activity
Q9:
The cardiac cycle has two distinct phases, systole and diastole.
Complete the following statement: The diastole phase occurs when the ventricles and the atrioventricular valves open.
- Arelax
- Bcontract
Q10:
What is the primary function of the sinoatrial node (SAN)?
- AInitiating the electrical impulse that generates a heartbeat
- BPassing electrical impulses through the walls of the ventricles
- CInitiating blood flow through the veins of the heart
- DEncouraging division and replication of heart cells
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