18 Questions
What is the normal pace of the heart in beats per minute?
70 to 80
What is the term for the braking provided by the parasympathetic nervous system?
Vagal tone
What is the term for an abnormal heart rhythm?
Arrhythmia
What is the primary function of the cardiac accelerator center in the autonomic nervous system?
To stimulate the SA and AV nodes to speed up the heart rate
What is the wave that represents ventricular repolarization in an electrocardiogram?
T wave
What type of receptors are located in the aorta and carotid arteries and alert the cardiac centers to changes in blood pressure?
Baroreceptors
What is the term for a focus other than the SA node that sets the heart's pace?
Ectopic focus
What is the sound produced by the closing of the semilunar valves during ventricular systole?
Dupp
What is the effect of potassium ions on the heart rate?
Negative chronotropic effect
What is the function of the parasympathetic neurons of the vagus nerve in regulating the heart rate?
To maintain the vagal tone at 70-80 beats/min
Which of the following has a positive chronotropic effect on the heart rate?
Epinephrine
What is the role of proprioceptors in regulating the heart rate?
To alert the cardiac centers to changes in the body's activity level
What is the primary factor that determines the cardiac output?
Stroke volume
What is responsible for increasing the heart rate during the 'fight or flight' response?
Cardiac accelerator
Which of the following receptors provides information to the cardiac regulator centers regarding blood pressure?
Baroreceptors
What is the term for the difference between the maximum cardiac output and the resting cardiac output?
Cardiac reserve
What is the name of the law that describes the relationship between preload and stroke volume?
Frank-Starling law
What is the normal range of heart rate in beats per minute?
64-80 bpm
Test your knowledge of heart physiology and regulation, focusing on chronotropic factors of the autonomic nervous system, including cardiac accelerator and inhibitory centers, sympathetic and parasympathetic neurons, and their effects on heart rate. Understand the role of proprioceptors and the vagus nerve in maintaining a healthy heart rhythm. Assess your understanding of heart physiology and regulation with this quiz!
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