Its role is to prevent the backflow of blood into the right ventricle after it contracts. The aortic valve sits between the left ventricle and the aorta and prevents backflow of blood into the left ventricle after it contracts. These phases can be seen in the following image. The heart beat is controlled by the sympathetic and parasympathetic branches of the autonomic nervous system.
The sympathetic system stimulates the heart to beat faster while the parasympathetic system returns the heart rate to its normal resting level. Electrical impulses action potentials from both systems are sent to the sino-atrial SA node. This is shown on the below image. The AV node then further distributes the impulse from the SA node to both ventricles which contract a fraction of a second after the contraction of the atria.
The rate at which the SA node sends out impulses determines the rate at which the heart beats. As well as receiving impulses from the autonomic nervous system, the rate at which the SA node sends impulses can also be influenced by hormones such as adrenaline. When released into the system adrenaline stimulates the SA node to send impulses at a faster rate, thus increasing the rate at which the heart beats.
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Your clients will thank you for it! The left ventricle of your heart is larger and thicker than the right ventricle. This is because it has to pump the blood further around the body, and against higher pressure, compared with the right ventricle. To make sure your blood flows in the correct direction, valves guard the entrance and exits of your hearts chambers. This publication is provided for education and information purposes only. It is not a substitute for professional medical care.
Information about a therapy, service, product or treatment does not imply endorsement and is not intended to replace advice from your healthcare professional. Readers should note that over time currency and completeness of the information may change. All users should seek advice from a qualified healthcare professional for a diagnosis and answers to their medical questions.
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