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WorksheetsHeart and Circulatory System Quiz
Total questions: 28
Worksheet time: 14mins
What happens if the SA node fails to function?
The heart stops beating entirely.
The AV node takes over as the pacemaker.
The Purkinje fibers immediately generate impulses.
The heart rate increases significantly.
What is the approximate heart rate generated by the AV node when it acts as the pacemaker?
20-40 beats per minute
40-60 beats per minute
60-80 beats per minute
80-100 beats per minute
If both the SA and AV nodes fail, what structures can generate electrical impulses?
Ventricular pacemakers (Bundle of His or Purkinje fibers)
Coronary arteries
Heart valves
Pericardium
What is the term for a slower-than-normal heart rate?
Tachycardia
Bradycardia
Arrhythmia
Fibrillation
What are irregular heart rhythms called?
Bradycardia
Tachycardia
Arrhythmias
Heart murmurs
Which of the following is NOT a typical treatment option for SA node failure?
Medications
Lifestyle changes, such as diet and exercise
Pacemaker
All of the above are potential treatment options.
The right and left bundle branches carry the electrical impulse:
Upwards towards the atria
Down both sides of the heart's septum to the ventricles
Only to the right ventricle
Only to the left ventricle
What is the primary function of the heart's conduction system?
Produce red blood cells
Filter waste products from the blood
Ensure the heart pumps blood effectively
Regulate body temperature
Where does the electrical impulse in the heart originate?
AV node
Bundle of His
SA node
Purkinje fibers
Which of the following is a potential consequence of SA node failure?
Increased heart rate
Fatigue
High blood pressure
Improved blood circulation
What is a pacemaker?
A medication to regulate heart rate
A surgical procedure to repair the heart
An implanted device to maintain a regular heart rhythm
A type of exercise to strengthen the heart
Where is the AV node located?
In the left atrium
At the junction of the atria and ventricles
In the right ventricle
Below the Purkinje fibers
What is the correct pathway of blood flow through the right side of the heart?
Pulmonary veins → Right atrium → Tricuspid valve → Right ventricle → Pulmonary valve → Pulmonary arteries → Lungs
Vena cava → Right atrium → Tricuspid valve → Right ventricle → Pulmonary valve → Pulmonary arteries → Lungs
Aorta → Right atrium → Tricuspid valve → Right ventricle → Pulmonary valve → Pulmonary arteries → Lungs
Pulmonary arteries → Right atrium → Tricuspid valve → Right ventricle → Pulmonary valve → Vena cava → Lungs
What is the correct order of blood flow through the left side of the heart?
Aorta → Left atrium → Mitral valve → Left ventricle → Aortic valve → Pulmonary veins → Body
Vena cava → Left atrium → Mitral valve → Left ventricle → Aortic valve → Aorta → Body
Pulmonary veins → Left atrium → Mitral valve → Left ventricle → Aortic valve → Aorta → Body
Pulmonary arteries → Left atrium → Mitral valve → Left ventricle → Aortic valve → Aorta → Lungs
Which of the following describes cardiac muscle tissue?
Non-striated, voluntary
Striated, involuntary
Non-striated, involuntary
Striated, voluntary
What are intercalated discs?
Structures that separate cardiac muscle cells
Specialized junctions that allow for rapid electrical signal transmission between cardiac muscle cells
Nerve endings that control the heart rate
Blood vessels that supply oxygen to the heart muscle
Why does cardiac muscle have a long refractory period?
To allow for continuous contraction
To increase the heart rate
To prevent sustained contraction (tetany) and ensure proper filling of the heart chambers
To decrease the force of contraction
What does the P wave on an electrocardiogram represent?
Ventricular depolarization
Atrial depolarization
Ventricular repolarization
Atrial repolarization
What does the QRS complex on an electrocardiogram represent?
Atrial depolarization
Ventricular depolarization
Ventricular repolarization
Atrial repolarization
What does the T wave on an electrocardiogram represent?
Atrial depolarization
Ventricular depolarization
Ventricular repolarization
Atrial repolarization
Where are baroreceptors located?
In the brain
In the carotid sinuses and aortic arch
In the heart muscle
In the blood vessels of the limbs
What is the function of baroreceptors?
To regulate heart rate
To control blood clotting
To monitor blood pressure changes
To transport oxygen in the blood
What is the function of the hepatic portal vein?
To carry oxygenated blood to the liver
To transport nutrient-rich blood from the digestive organs to the liver
To drain blood from the lower extremities
To carry blood from the liver to the heart
Which arteries branch off the aortic arch?
Pulmonary arteries, coronary arteries
Carotid arteries, femoral arteries
Brachiocephalic artery, left common carotid artery, left subclavian artery
Renal arteries, hepatic artery
Which factor has the greatest influence on blood flow?
Blood viscosity
Vessel length
Vessel radius
Blood pressure
How does increased blood viscosity affect blood flow?
Decreases blood flow
Increases blood flow
Has no effect on blood flow
Increases blood pressure
What is hydrostatic pressure?
The pressure exerted by proteins in the blood
The pressure that forces fluid out of the capillaries
The pressure that pulls fluid back into the capillaries
The pressure in the veins
What is colloid osmotic (oncotic) pressure?
The pressure exerted by proteins in the blood that pulls fluid back into the capillaries
The pressure that forces fluid out of the capillaries
The pressure in the arteries
The pressure in the veins
