medulla oblongata
The medulla oblongata which is in the lower half of the brain stem controls heart rate and breathing.
The arteries in the body carry blood away from the heart. Each time the heart muscle contracts, it sends a rush of blood into the artery which causes pressure that can be felt by the fingers.
Heart rate monitors measure the electrical activity of the heart to get their readings. A strap around the chest receives the electrical readings, and sends it to a device, which can be to a special receiver, that also functions as a wristwatch, or to a mobile phone.
The heart is a muscle. The brain sends impulses to the heart along nerve fibres. These impulses are sent to nodes that line the heart, these nodes regulate the rate and rhythm of the heart as it contracts to pump blood to the body.
Sympathetic
Pacemaker cells control the heart rate of the heart.
Heart rate is simply the number of times that the heart beats per minute. This is generated by the "pacemaker" of the body which is the signal sent from the brain to the heart's sinoatrial (SA) node. This causes the initiation of contraction of the cardiac muscle which spreads across the heart to contract the atria and ventricles in a rhythmic fashion. The number of times this signal is sent from the brain to the heart gives the heart rate.
medulla oblongata
The medulla oblongata which is in the lower half of the brain stem controls heart rate and breathing.
pacemaker
sinoatrial node
medulla oblongata!
The arteries in the body carry blood away from the heart. Each time the heart muscle contracts, it sends a rush of blood into the artery which causes pressure that can be felt by the fingers.
Heart rate monitors measure the electrical activity of the heart to get their readings. A strap around the chest receives the electrical readings, and sends it to a device, which can be to a special receiver, that also functions as a wristwatch, or to a mobile phone.
The heart is a muscle. The brain sends impulses to the heart along nerve fibres. These impulses are sent to nodes that line the heart, these nodes regulate the rate and rhythm of the heart as it contracts to pump blood to the body.
The textbook value is 72, at rest. The most important factor affecting your heart rate is your physical condition. Athletes can easily have a heart rate of 55 at rest, and the better your physical condition, the slower your heart rate tends to increase. Heart rate over 90 may signal an underlying cardiologic condition, so if this is the case, see a physician.