A2 Biology Unit 5 Flashcards - Coordination 0.0 / 5 ? BiologyHuman, animal and plant behaviourA2/A-levelAQA Created by: Kira BarnettCreated on: 01-04-16 20:50 What are the two main forms of coordination in mammals? The nervous system and the hormonal system 1 of 10 What does the nervous system do? Uses nerve cells to pass electrical impulses along their length. Neurotransmitters are stimulated which are used in communication 2 of 10 What does the hormonal system do? Produce chemicals used for communication 3 of 10 What are two examples of chemical mediators? Histamine and Prostaglandins 4 of 10 What are chemical mediators? Chemicals that are released from certain mammalian cells 5 of 10 What is an example of a plant growth factor? Indoleacetic acid (IAA) 6 of 10 Name the features of a neurone Cell body, dendrons, axon, schwann cells, myelin sheath, nodes of ranvier 7 of 10 What is a neurone described as at resting potential? Polarised 8 of 10 What affects the speed of a nerve impulse? Myelin sheath, diameter of the axon, temperature and the potassium pump 9 of 10 What is the refractory period? Period where action potential is impossible as it limits the amount of action potentials and means its only in one direction 10 of 10
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