Conductance of Action Potentials - Principles of Physiology - Past Exam, Exams of Biology

Download Conductance of Action Potentials - Principles of Physiology - Past Exam and more Exams Biology in PDF only on Docsity! 1 PRIFYSGOL ABERYSTWYTH UNIVERSITY INSTITUTE OF BIOLOGICAL, ENVIRONMENTAL AND RURAL SCIENCES SEMESTER 2 EXAMINATIONS 2009 MODULE BS13210 - PRINCIPLES OF PHYSIOLOGY Time allowed — 2 hours Please read these instructions carefully: 1. The paper is divided into two parts. Section A carries 45 marks, Section B carries 25 marks. 2. Section A consists of short-answer questions, all of which should be attempted. All questions should be answered in one of the answer books provided. 3. In Section B you are required to answer one question. This should be written in a separate answer book. 4. The answer books should be tied together using the ties provided. You are recommended to spend 70 minutes on Section A and 50 minutes on Section B. Section A (45 Marks) Answer all questions in one answer book. Questions carry equal marks. 1. How does myelination speed up conductance of action potentials? List the two cell types responsible for myelination of axons. 2. Many animals use heat exchangers. Draw a labelled diagram of the heat exchanger (rete mirabile) found in tuna. 3. How can terrestrial vertebrates reduce water loss? 4. Explain the difference between diffusion and osmosis. 5. List the four main osmoregulatory organs in invertebrates. 6. List three steroid hormones and their site of origin. 7. Explain, with the aid of diagrams, the term endocrine, paracrine and autocrine. 8. What is the function of the carotid bodies? 9. How are milk fat, casein and lactose secreted? Turn over