Please sign up for the course before taking this quiz. The medulla oblongata plays an important role in neural control of breathing during exercise. Describe how the medulla oblongata increases breathing rate (2 marks)2This is a practice exam question. The question says DESCRIBE but is worth 2 marks. This means you need to make 2 points but each one is only brief. The medulla oblongata increases the frequency of signals sent down the sympathetic nerve to the muscles (1) and then the respiratory muscles contract at a faster rate (1) The chemoreceptors play an important role in neural control of breathing during exercise. Describe how the chemoreceptors increase breathing rate (2 marks)2This is a practice exam question. The question says DESCRIBE but is worth 2 marks. This means you need to make 2 points but each one is only brief. Chemoreceptors detect increases or decreases in blood (1), like increases or decreases in carbon dioxide and lactic acid. The chemoreceptors then inform the medulla oblongata in the brain (1). Who does the chemoreceptor inform of a change in blood acidity?1 The diaphragm and intercostal muscles The sympathetic nerve The Medulla Oblongata Which nerve sends the signal to the respiratory muscle to increase breathing rate and tidal volume?1 Atrioventricular Sympathetic Parasympathetic Name the hormone responsible for an anticipatory rise in tidal volume and breathing rate?1 Testosterone Insulin Adrenaline List the correct order of communication sequence involved in the nervous control of breathing?1 Chemoreceptor, Sympathetic Nerve, Medulla Oblongata, Respiratory Muscle Chemoreceptor, Medulla Oblongata, Sympathetic Nerve, Respiratory Muscle Chemoreceptor, Respiratory Muscle, Sympathetic Nerve, Medulla Oblongata What does a chemoreceptor do?1 Detects increases of or decreases in oxygen, carbon dioxide and acidity in the blood Increases tidal volume, breathing rate and heart rate Informs the sympathetic nervous system State the role of chemoreceptors (1 mark)1This is a practice exam question. The question says STATE, this means one simple point needs to be made To chemical changes in the blood (1) Which component makes the decision to increase or decrease tidal volume and breathing rate?1 Sympathetic Nerve Medulla Oblongata Chemoreceptor During a cross country run your tidal volume and breathing rate increases. Analyse how your increased breathing rate is controlled (6 marks)6This is a practice exam question. The question says ANALYSE and is worth 6 marks. This means you need to break the topic of ‘Control of Breathing’ into parts and explain each part in an appropriate order. You are not graded on making 6 points (like a describe or explain question) but instead graded on how well you break the topic into parts and then how well you organise you answer. Breathing rate can be controlled through neural and chemical control. Chemoreceptors detect a change in oxygen, carbon dioxide and acidity levels in the cross country runners blood. They will detect low levels of oxygen, higher levels of carbon dioxide and acidity. The chemoreceptors send a message informing the medulla oblongata in the brain. The medulla oblongata sends a signal via the to the respiratory muscles. This causes the respiratory muscles ie the diaphragm and intercostal muscles to worker harder. As a result, more oxygen enters the blood stream via the lungs and more carbon dioxide is removed from the blood stream and breathed out. This enables the cross country runner’s muscle to receive more oxygen and work aerobically.