Biology Topic 7B Breathing and Heart rate 0.0 / 5 ? BiologyHuman, animal and plant behaviourA2/A-levelEdexcel Created by: IonaharCreated on: 18-01-23 19:26 What happens to your heart rate and breathing rate when doing exersize? It increases 1 of 26 Why does your heart rate increase? To deliver more oxygen to the muscles faster and remove carbon dioxide faster 2 of 26 Why does breathing rate increase? To obtain more oxygen 3 of 26 What is the function of the medulla oblongata? To carry signals from the brain to the rest of the body 4 of 26 What are the names of the two ventilation center? Inspiratory centre expiratory centre 5 of 26 How does the inspiratory centre allow us to breath in? It sends signals to the diaphragm and intercostal muscles to make them contract 6 of 26 What receptors are stimulated when the lungs stretch? The stretch receptors 7 of 26 What do the stretch receptors do? Send nerve impulses to the medulla oblongata to inhibit the action of the inspiratory centre 8 of 26 What do the expiratory centre then do? Send impulses to the diaphragm and inter costal muscles to relax 9 of 26 After you exhale, what allows the inspiratory centre to work again? The stretch receptors are no longer stimulated 10 of 26 How does exercise trigger an increase in breathing? Decreasing the pH levels 11 of 26 What decrease pH levels? Exercise as it reduces the amount of O2 in the blood 12 of 26 What detect the change in pH? The chemoreceptors 13 of 26 Once the pH level is detected by the chemoreceptors what happens? The medulla oblongata send impulses to the intercostal muscles to increase breathing rate 14 of 26 What is ventilation rate? volume of air ventilating the lungs / minute 15 of 26 What centre in the medulla oblongata controls heart rate heart rate? Cardiovascular centre 16 of 26 What does the cardio vascular centre control in the heart? The speed at which the SAN 'fires' 17 of 26 What 2 receptors detect stimulus in the blood? Chemical and pressure receptors 18 of 26 What are the pressure receptors called? baroreceptors 19 of 26 Where are the baroreceptors found? Aortic and Carotid bodies 20 of 26 What 2 neurons does the cardiovascular centre send impulses along? Sympathetic or parasympathetic neurons 21 of 26 Which neuron speeds up heart rate? The sympathetic 22 of 26 What neuron slows down heart rate? The parasympathetic 23 of 26 What neurotransmitters to the parasympathetic nerve secrete to respond to high blood pressure or low Co2? actlycholine 24 of 26 What neurotransmitters to the sympathetic nerve secrete to respond to low blood pressure or high Co2? noradrenaline 25 of 26 How do you calculate cardiac output? heart rate x stroke volume 26 of 26
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