Explain physiologic adaptations of the cardiorespiratory system of seals to deep diving.
Point out differences between seal and human physiology related to deep dives.
Evaluate respiratory and cardiac function.
Measure oxygen consumption and calculate the total amount of oxygen needed for dives
of various durations and compare to estimated stores in the lungs, blood and tissues.
Introduction:
Active cells require a constant supply of oxygen in order to produce energy to carry out cellular
processes and release carbon dioxide as a waste product. The body must replenish this supply
of oxygen and remove the build-up of carbon dioxide, as it is toxic to cells in high
concentrations.
Our respiratory rate, or the number of breaths we take per minute, and the depth at which we
respire with each breath is controlled by the respiratory center, located in the brainstem. It
ensures that our respiratory effort matches the metabolic demands of our body.
In this lab you will head to a research lab in Antarctica to learn how seals have adapted to
perform long, deep dives. How Weddell seals can dive up to 600 meters for 30 minutes is a bit
of a mystery. In this simulation you will learn about oxygen stores, aerobic dive limit, aerobic and
partially anaerobic ATP generation, and special cardio-respiratory adaptations that allow seals
to perform deep, long dives that would be impossible for humans without scuba diving
equipment. This will be a fun way to learn more about human cardiorespiratory physiology as
well. Humans and seals have different amounts of oxygen available to them and store it at
different proportions in lungs, blood, and muscle. Do seals and humans have the same factorial
increase in oxygen consumption? Monitor 3 dives and collect data on oxygen and lactate to find
out!
Assignment:
Part 1: Complete Labster “Cardio-respiratory Physiology: How can seals dive so deep for so
long?”
As you complete the lab, have the lab report ready to record data. The theory section of the lab
is a useful resource.
Part 2: Complete the lab report.
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