Cellular Respiration Module



Cellular Respiration Module:

Connecting The Three Body Systems

Digestive, Respiratory and Circulatory

Driving Questions:

Have you ever though about why we eat and breath?

How do our bodies use food and oxygen to get energy?

How does this happen within our cells?

Story:

Our bodies need food and oxygen to get energy. How do our cells get the energy from food and oxygen?

Eric and Roger are classmates and good friends. Both are 12 years old and exercise regularly. Their science assignment is to figure out how the human body uses food and oxygen to get energy. They were asked to run (as a form of exercise) and measure the following:

(1) the rate of muscle cell contractions;

(2) how much carbon dioxide (CO2) they exhaled (breathed out);

(3) their average body temperature; and

(4) how much oxygen (O2) they inhaled (breathed in

Eric and Roger took note of what they ate before running. Then they went running together. They were each given the measurement instruments they needed. Here are their measurements and their body conditions:

The following table is a comparison of Eric and Roger’s physical condition.

Table (1) Physical Fitness

| | | |

| |Eric |Roger |

| | | |

|Height (cm.) |158 |161 |

| | | |

|Weight (kg.) |52 |50 |

| | | |

|Exercise |regularly |regularly |

What to do in pairs:

(1) Look at the data about Eric and Roger.

(2) Fill out the first column of the study worksheet and explain you can conclude about each graph or table shows starting with study number 2. In other words what is measured and what is changing over time

This study describes muscle contraction in the presence of varying levels of sugar and oxygen.

Figure (1) Muscle Cell Contraction during Exercise

Microscopic view of muscle cells

[pic]

Note: when we use muscles, like doing exercise, the muscle cells in the muscle contract (tighten). The harder the exercise, the faster the muscles contract.

Rate of Muscle Cell Contractions

[pic]

This figure compares the amount of carbon dioxide Eric and Roger exhale while exercising.

Figure (2) Exercise and CO2 Exhaled (breathed out)

[pic]

This table is the comparison of body temperature for Eric and Roger as they run.

Table (2) Body Temperature during Run

| | | | | |

| |10 min. |20 min. |30 min. |40 min. |

| | | | | |

|Eric |36.7 |36.9 |37.4 |38.0 |

| | | | | |

|Roger |36.6 |36.9 |37.2 |37.8 |

**Note: Body Temperature in Degree Celsius

This figure compares the amount of oxygen Eric and Roger inhaled while exercising.

Figure (3) Exercise and O2 Inhaled (breathed in)

[pic]

However, for some reason Eric could not keep up with Roger’s running pace after a while. They are in similar physical condition, so what could be the reason? Eric thought that it might have to do with what they ate before running. Eric had a big steak beforehand, and Roger had pasta and a fruit cup instead. Below is the graph describing how long they ran based on different foods they ate.

Figure (4) Low-Carb Runner vs. High-Carb Runner

[pic]

**Note- Remember Eric and Roger’s assignment was to link their measurements to how our bodies use food and oxygen to get energy and how this happen within our cells.

This figure compares the density (amount/cell)

of various organelles in Eric and Roger’s muscle cells.

Figure (5) Cellular organelles

|Organelles |Eric |Roger |

|Nucleus |normal |normal |

|Mitochondria |normal |slightly high |

|Ribosomes |normal |normal |

|Endoplasmic reticulum |normal |normal |

Finally

We will discuss each study together in class to be sure we are interpreting the data correctly

-----------------------

KEY: -------- Eric

- - - - - Roger

KEY: -------- Eric

- - - - - Roger

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