B4: Organising Animals and Plants 4.4 - 4.7 0.0 / 5 ? BiologyHelping the HeartBreathing and Gas ExchangeTissues and Organs in PlantsTransport Systems in PlantsGCSEAQA Created by: prodbyteeCreated on: 26-05-20 12:33 Why might doctors operate and replace faulty heart valves ? Withstanding high pressures; valves might start to leak or become stiff and not open fully over time. 1 of 7 Why is it important the heart valves work efficiently ? People with faulty valves may become breathless and without treatment, will eventually die. 2 of 7 What controls the resting heart rate ? A group of cells found in the right atrium of the heart act as a natural pacemaker. 3 of 7 What are the effects of extremely slow or fast heart beats ? Lack of oxygen or unable to pump blood properly. 4 of 7 What are artificial pacemakers ? Electrical devices used to correct irregularities in the heart rhythm. 5 of 7 How do artificial pacemakers work ? Artificial pacemakers send strong regular electrical signals to stimulate the heart. Some even act after sensing irregularities. 6 of 7 Name one advantage and one disadvantage of artificial pacemakers. Increased quality and length of life, regular medical check-ups. 7 of 7
Comments
No comments have yet been made