1. Do Now:  Without talking, read the lab script which will tell you how to dissect a heart Reminder:  Disease projects due on Tuesday 19 th FebHātarei, 18 Paenga-whāwhā 2015

2. Safety:  Like any meat, the heart may be carrying food poisoning bacteria. So: wear rubber gloves thoroughly wash hands afterwards newspaper on desks newspaper + hearts into black bin bags afterwards Would anyone prefer not to watch or dissect?

3. Procedure 1: 1)Newspaper on desks 2)Put on rubber gloves 3)Do Investigation 1 (10min) One person in your group to tick off each step on your lab script when you have done it / found the relevant part of the heart

4. Procedure 2: 1)Scissors and scalpel from Mr Cooper 2)Do Investigation 2 (15 min) One person in your group to tick off each step on your lab script when you have done it / found the relevant part of the heart 3)Clean-up:  Wrap heart & gloves in newspaper  Put in black bin bag  Wash hands and scissors  Wipe down tables

5. Time (mins) Pulse rate (beats per minute) Student 1Student 2 05663 25675 4120110 6130 8 1080120 1265110 1456100 165680 185670 Two students carried out an activity to show the effect of exercise on pulse rate. They both did exactly the same exercise and both stopped exercising after exactly 8 minutes. a) What was the resting pulse rate of student 1? b) Estimate student 2’s pulse rate after 13 minutes c) Explain why our pulse rate goes up during exercise. d) From the results in the chart which student appears to be the fittest? Explain your answer.

6. a) 56 b)105 c) As we exercise, our muscles need more oxygen for respiration in our cells to produce energy. So the heart beats faster to pump more blood around the body. d) Student A is the fittest because he returns to his resting pulse more quickly that the other student