[Bio1] Heart dissection lab reminders

Please visit your meat vendor ahead of time to ask about the availability and price of a pig’s heart. If buying the heart more than a day before the dissection, please freeze it to avoid an unpleasant experience. The night before dissection, place it in the refrigerator portion so that it will thaw. Do not bring a frozen heart to school during dissection!

You can take a look at this video to prep for the heart dissection on Thursday (Be, Cs) and Friday (Li). Bring your copy of the first SW with the drawing of a four-chambered heart on dissection day.

This is how we will make the initial incision on dissection day, much like slicing a mango.
The structures you will need to identify:

  • Chambers of the heart
  1. left atrium
  2. right atrium
  3. left ventricle
  4. right ventricle
  • Valves
  1. tricuspid valve
  2. bicuspid valve
  3. aortic semilunar valve
  4. pulmonic/pulmonary semilunar valve
  • Blood vessels
  1. aorta
  2. inferior vena cava
  3. superior vena cava
  4. pulmonary artery
  5. pulmonary vein
  • Other structures
  1. chordae tendinae
  2. interventricular septum
  3. papillary muscles
  4. trabeculae carnae

Some announcements

The group (by 3’s) respiration HW (due on the first meeting of next week) may be found here. Also be on the alert for a quiz on human circulation this week. 😀

The second Mythbusters proposal is due on Friday next week (September 16th). A mythbusters team is composed of 6 members from within your section (you can choose your own team members). Include the following information in your proposal:

  1. Names of team members
  2. Creative title
  3. Myth/notion to be proven or debunked (must be related to either the digestive/circulatory/plant transport systems)
  4. Scientific basis/procedures/processes to be used in testing the notion (experiment? demonstration? literature survey? interview with an expert?
  5. 3 reliable references (scientific journals, printed materials)
  6. Chosen medium (video/animation/presentation/poster/website)

Due to popular demand, BeLiKNa will have a joint Mythbusters screening at the ASTB AVR this Friday starting from the first UB onwards. You are all invited to attend. 😀

Sites and tips for today’s computer-aided activity

Part A: http://www.hhmi.org/biointeractive/circulatorium/frames.html

Guide to filling up the table

  • Path of bloodflow — Look at the animation and trace the flow through the organs. In some circulatory systems, blood is pumped from the heart to the lungs and goes back to the heart before being pumped to the other organs of the body. This is called double circulation.
  • Type of circulation — Click on the “Heart detail.” In single circulation, the heart only receives one type of blood in one chamber and pumps it out. In double circulation, hearts with 2 atria receive blood from 2 different locations and pump them out.
  • Blood mixing — You will see if blood mixes in the heart if the colors of the blood change (i.e. turn purple) upon entering the ventricle.
  • Heart detail — Just write down how many atria and ventricles each heart would have.
  • Other notes — This space is for other interesting facts you may have read while doing the activity.

Part B: http://msjensen.cehd.umn.edu/1135/Links/animations/Flash/0028-swf_the_cardiac_cy.swf

  • You know that the chambers are in systole if the walls fold in and the chamber becomes narrower due to the contractions. They are in diastole if they expand and go back to their original size.