The brain and nervous system 0.0 / 5 ? BiologyBiological molecules, organic chemistry and biochemistryA2/A-levelEdexcel Created by: francesca_321Created on: 11-05-16 16:50 How does heart rate get controlled during exercise How does heart rate get controlled during exercise? 1 of 18 What is increased? respiration rate 2 of 18 What is there more CO2 in? blood 3 of 18 What is also increased? Lactate 4 of 18 What is stimulated in the medulla? chemoreceptors 5 of 18 What is in the medulla? The cardiovascular control centre 6 of 18 how is this activated? autonomic nervous system 7 of 18 Where are impulses from? and what is increased? medulla and more noradrenaline 8 of 18 What is increaseD? SAN increased 9 of 18 What increases? heart rate 10 of 18 What is a nerve impulse? What is a nerve impulse? 11 of 18 What is the resting potential of a nerve? 70mV 12 of 18 What happens when voltage dependent NA+ channels open? Na+ flow into axon depolarising the membrane 13 of 18 What then closes? NA+ channels close 14 of 18 What opens? K+ channels open 15 of 18 What leaves axon? and repolarises the membrne? K+ 16 of 18 What is hyperpolarised? membrane, K+ channels close 17 of 18 What diffuses back into the axon? recreate the resting potential 18 of 18
Comments
No comments have yet been made