Control of heart rate Flashcards
What is the primary function of the heart?
To pump blood throughout the body.
True or False: The heart rate is controlled solely by the nervous system.
False.
Fill in the blank: The _____ node initiates the heartbeat.
sinoatrial (SA)
What role does the atrioventricular (AV) node play in heart rate control?
It delays the electrical signal before it passes to the ventricles.
Which part of the autonomic nervous system increases heart rate?
Sympathetic nervous system.
What is the effect of the parasympathetic nervous system on heart rate?
It decreases heart rate.
Identify the hormone that increases heart rate during stress.
Adrenaline (epinephrine).
What is the term for the electrical conduction pathway in the heart?
Cardiac conduction system.
True or False: Heart rate can be influenced by physical activity.
True.
What is the normal resting heart rate range for adults?
60 to 100 beats per minute.
Fill in the blank: The _____ system is responsible for the involuntary control of heart rate.
autonomic nervous
What is tachycardia?
An abnormally fast heart rate, typically over 100 beats per minute.
What is bradycardia?
An abnormally slow heart rate, typically below 60 beats per minute.
Which structure in the heart is responsible for pumping blood to the lungs?
Right ventricle.
What is the role of baroreceptors in heart rate control?
They detect changes in blood pressure and help regulate heart rate.
True or False: Exercise has no effect on heart rate.
False.
What is the relationship between heart rate and cardiac output?
Cardiac output is the product of heart rate and stroke volume.
Fill in the blank: The _____ is the primary pacemaker of the heart.
sinoatrial (SA) node
What effect does increased body temperature have on heart rate?
It typically increases heart rate.
What is the function of the Purkinje fibers?
To distribute electrical impulses throughout the ventricles.
What role does calcium play in heart muscle contraction?
Calcium ions are essential for the contraction of heart muscle fibers.
True or False: The heart can generate its own electrical impulses.
True.
What is the effect of caffeine on heart rate?
It usually increases heart rate.
What does ECG stand for?
Electrocardiogram.
