Control of Heart Rate in Humans - Groby Bio Page

Control of Heart Rate in Humans - Groby Bio Page

Label heart diagrams deoxygenated blood to the lungs deoxygenated blood from the body oxygenated blood to the body

oxygenated blood from the lungs Know how we control heart rate Outline the hormonal and nervous

mechanisms involved in the control of heart rate Using the key words below in pairs write a paragraph to describe the cardiac cycle

Pacemaker, Atrio-Ventricular node, myogenic, Sino-Atrial node, Atria, Ventricles, Purkyne Tissue When finished swap with another pair and see if you can improve their work Think about what happens: when

you walk down a quiet road late at night and youre afraid your being followed Or before an exam.

Increases the heart rate, to increase oxygen supply to the muscles. Increases the ventilation rate, so that more oxygen can be absorbed in the lungs.

Decreases peristalsis in the gut so there is more blood available for the heart and lungs. Other parts of the body also respond to enable increased sensory awareness eg pupils dilate Relaxing responses - decreases over all physical activity, so it is associated with

rest. It decreases heartbeat rate It decreases ventilation rate

It increases peristalsis in the gut, so that food can be digested

Nerves from cardiovascular centre in medulla oblongata (in brain) supply heart Connect to SAN Effect frequency of beats Action potentials sent down the accelerator nerve (sympathetic NS) increase heart rate Action potentials sent down the vagus nerve (parasympathetic NS) decrease heart rate

Heart muscle responds to adrenaline in blood

Resting heart rate controlled by SAN Varies from person to person Frequency of 60-80 beats per min This can be controlled by the cardiovascular centre in the medulla oblongata Movement of limbs

detected by stretch receptors in muscles Send impulse to cardiovascular centre Increases heart rate Production of CO2 during exercise Reduces blood pH

Detected by chemoreceptors in carotid arteries, aorta and brain Send impulse to cardiovascular centre Increases heart rate Decrease in CO2 after exercise Reduces activity of accelerator nerve

Decrease in heart rate Adrenaline secretion Increases heart rate Blood pressure

Monitored by stretch receptors in walls of carotid sinus Blood pressure too high, impulse sent to cardiovascular centre, impulse sent down vagus nerve Decrease in heart rate

Read a section of information on artificial pacemakers and make notes about its development, forming a timeline [5]

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