Careful Coordination and Breath of Life Check for Understanding.notebook
February 01, 2011
Check for Understanding: Careful Coordination
1. Which response to stimuli is rapid and short term, example, reflex?
Answer
Nervous or Endocrine
2. Which response is slower and has longer lasting changes, example, a change in
Answer
urine production?
Nervous or Endocrine
3. How do cells know which hormone (chemical message) is meant for it?
Answer
4. This type of response corrects or goes against what is happening in your
body. For example, a decrease in blood pressure results in an increase in heart
rate so that blood pressure will increase is an example of (positive or negative)
Answer
feedback?
5. This type of response moves toward or amplifies what is happening in your
body. For example, when you get a cut more clotting fibers are sent to the area
of the cut, increasing blood clotting is an example of (positive or negative)
Answer
feedback?
6. An increase of CO2 in your blood leads to an increased acidity in your blood.
This is sensed by pH sensors in the brain and respond with messages to
increase breathing rate. This response decreases the amount of CO2 in your
Answer
blood. Positive or negative feedback?
Jan 31­9:53 AM
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Careful Coordination and Breath of Life Check for Understanding.notebook
February 01, 2011
Check for Understanding: The Breath of Life
1. Where does gas exchange from the external environment to
the internal environment happen?
Answer
2. Why does gas exchange occur (O2 from lungs to blood, CO2
from blood to lungs)? Answer
3. How does air get from the external environment of the
classroom to your internal environment? Know the path!! Answer
4. What causes blood to become more acidic?
Answer
5. Why does breathing rate increase with increased activity?
Answer
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Careful Coordination and Breath of Life Check for Understanding.notebook
February 01, 2011
Nervous
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3
Careful Coordination and Breath of Life Check for Understanding.notebook
February 01, 2011
Endocrine
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Careful Coordination and Breath of Life Check for Understanding.notebook
February 01, 2011
Receptors (like a lock and key)
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Careful Coordination and Breath of Life Check for Understanding.notebook
February 01, 2011
Negative Feedback
Initial condition: Decrease in blood pressure
Body Responds: Increasing heart rate
Result: Increase in blood pressure
Jan 31­10:10 AM
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Careful Coordination and Breath of Life Check for Understanding.notebook
February 01, 2011
Positive Feedback
Initial Condition: Cut, clotting factors work to clot cut
Body Responds: Increase clotting factors to wound
Final Condition: More clotting factors travel to cut to stop
the bleeding
Jan 31­10:12 AM
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Careful Coordination and Breath of Life Check for Understanding.notebook
February 01, 2011
Negative Feedback
Initial Condition: Increased acidity in blood due to
increased CO2 production when cells are working harder
Body Responds: pH sensors in brain detect increased
acidity and instruct rib muscles and diaphragm to increase
breathing
Final Condition: Breathing rate increases to decrease the
amount of CO2 in blood which decreases the acidity.
Jan 31­10:13 AM
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Careful Coordination and Breath of Life Check for Understanding.notebook
February 01, 2011
Capillary and alveoli
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Careful Coordination and Breath of Life Check for Understanding.notebook
February 01, 2011
Diffusion
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Careful Coordination and Breath of Life Check for Understanding.notebook
February 01, 2011
O2 in the atmosphere --> nose or mouth (warmed,
moistened, cleaned) --> larynx --> trachea -->Bronchial
tubes (lined with cilia and mucus) --> alveoli (tiny air sacs,
increase the surface area of lungs) --> O2 diffuses into the
capillary and binds with hemoglobin in RBC and travels to all
parts of the body :)
Reverse for CO2 :)
Jan 31­10:19 AM
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Careful Coordination and Breath of Life Check for Understanding.notebook
February 01, 2011
An increase in CO2 as a waste product due
to cells using more energy.
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Careful Coordination and Breath of Life Check for Understanding.notebook
February 01, 2011
Increased CO2 in blood (from cells using more
energy) results in an increased acidity of
blood. pH sensors in the nervous system
detect change and cause the rib muscles and
diaphragm to increase breathing rate.
Jan 31­10:45 AM
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