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WorksheetsCH11.2 Regulation of the Heart
Total questions: 20
Worksheet time: 11mins
What structure acts as the heart’s primary pacemaker?
Atrioventricular node
Purkinje fibers
Bundle of His
Sinoatrial (SA) node
Where is the SA node located?
Left ventricle
Left atrium
Right atrium
Pulmonary vein
Which part of the brain contains the cardiac center?
Cerebellum
Cerebrum
Medulla oblongata
Thalamus
What does the sympathetic branch of the cardiac center do?
Slows heart rate
Increases heart rate
Releases acetylcholine
Decreases contraction strength
What type of receptor detects changes in blood pressure?
Chemoreceptors
Mechanoreceptors
Baroreceptors
Photoreceptors
What is the function of the AV node in the conduction pathway?
Initiates the heartbeat
Contracts the ventricles
Delays the impulse
Sends impulse to atria
Which hormone increases heart rate?
Insulin
Cortisol
Thyroxine
Glucagon
During exercise, which of the following changes occur due to chemoreceptor activation?
Decrease in heart rate
Decrease in blood flow
Increase in blood pressure
Decrease in respiratory rate
What part of the conduction system carries the impulse to the ventricles?
AV node
Purkinje fibers
Bachmann’s bundle
SA node
What does the QRS complex on an ECG represent?
Atrial contraction
Ventricular relaxation
Ventricular contraction
SA node depolarization
Which of the following is not a role of the cardiac center?
Adjust heart rate
Release thyroid hormones
Adjust contraction strength
Regulate stroke volume
Which receptors respond to muscle activity and stretch?
Chemoreceptors
Mechanoreceptors
Baroreceptors
Proprioceptors
What neurotransmitter is released by the parasympathetic system to slow heart rate?
Epinephrine
Dopamine
Acetylcholine
Serotonin
What carries the impulse from the AV node into the septum?
SA node
Bundle of His
Purkinje fibers
Left bundle branch
What is the mechanical event associated with the T wave on an ECG?
Atrial contraction
Ventricular contraction
Ventricular relaxation
Atrial relaxation
Where is the sinoatrial node?
(a)
Where is the bundle of His ?
(a)
Where is the left bundle ?
(a)
Normal range in bpm = (a) .
A person is considered tachycardic when bpm (b) .
A person is considered bradycardic when bpm (c) .
If an elite athlete has a resting HR of < 60 bpm, they are considered bradycardic and need to seek medical assistance immediately.
True
False
