The rate and pace of the heart are set by the SA node. There are backup systems in place if the SA node fails to do its job.
it adjusts the heart rate to correspond to the body's need for oxygen
Purkinje fibers
Sinus rhythm
The difference between a person's resting and target heart rate reflects the amount of work the heart must do to meet the increased demands of the body when exercising.
depressants affect the heart rate by its heart rate
it adjusts the heart rate to correspond to the body's need for oxygen
yes it does.
when sprinting (putting in as much effort as possible) your heart rate will reach around 200bpm (beats per minute). Swimming at an average pace your heart rate will be around 150-160 bpm and at a slow easy leisurely pace your heart rate will be around 120-140 bpm. Heart rates will vary for different people and in general the younger you are, the higher your heart rate will be and the fitter you are, the lower your heart rate will be.
The pace maker uses electrical impulses to regulate heart rate. It is used when the bodies own impulses from the brain are not able to do the job anymore.
a b c
Adrenaline acts on the Beta-1 adrenoceptors on the heart muscle to increase the heart rate and the force of the contraction. Leading to more blood being pumped around the body at a higher pace.
Purkinje fibers
Sympathetic nerves increase the heart rate by releasing norepinephrine, while parasympathetic nerves decrease the heart rate by releasing acetylcholine. This affects the pacemaker by altering its firing rate and influencing overall heart rhythm.
The human heart could compensate for flow rate changes to maintain blood pressure by setting the pace at which it beats and maintains blood flow. When a heart rate increases, blood pressure will rise, and when a heart rate decreases, blood pressure will drop.
You can maintain your desired heart rate by wearing a heart rate monitor. These are small electronic devices that usually resemble a wrist watch. The heart rate monitor will display your current heart rate and allow you the opportunity to either speed up or slow down your running pace in order to stay within what your desired heart rate is. If you notice your heart rate is getting higher than desired, slow down, and if it is lower than desired, speed up.
Sinus rhythm
when you exercise, the heart rate increases, (as does your breathing pace), so that more oxygen can be carried in the blood to your muscles. The more intense the exercise, the more your muscles have to work, so more oxygen is required and your heart rate will increase. The quicker you heart rate returns to normal, the better your fitness.