Parts of the Respiratory System

Thursday in class we reviewed diffusion (movement from high to low concentration -ex gas exchange between the alveoli and pulmonary capillaries). We also reviewed how the pressure change in inhalation and exhalation works via the diaphragm.

Inhale - pressure is higher outside so air rushes in as the diaphragm contracts and pulls down to make the thoracic cavity larger to allow the lungs to expand. (Inspiration in the video below)

Exhale - pressure is higher in the lungs so air is forced out by the diaphragm relaxes and making the thoracic cavity smaller. (Expiration in the video below)

Finally, we began to delve into the structure and function of the respiratory system. Remember structure and function is one of our main topics this term. Here are a few that we talked about on Thursday. We will finish the parts on Saturday.

Mouth - take in air
Nose -takes in air and lined with mucus membranes and hairs to filter particles out, the blood also warms the air (remember air then goes through the pharynx/larynx - Saturday)
Pharynx
Larynx
Trachea - tubular and ridged with cartilage.  allows air to get to the lungs and the rings prevent it from closing
Bronchi (2)
Bronchioles
Aveoli - stretchy air sacs with lots of surface area "bunch of grapes." where gas exchange happens. high surface area allows for more exchange, while the stretch allows for expansion when filled with gases.

Mice on Ice!

Today in lab we explored how external stimuli such as changes in temperature (in our case cold) requires organisms to respond to restore homeostasis.

As the temperature changed (got colder) the mice had to do more cellular work (why? what is happening?) to maintain a constant body temperature. So if more cellular work is required, then more ATP must be made.  What process contributes the energy needed for ATP formation?

As such what happens to the mouse's breathing rate?

Oxygen Probe and Cage

Ice setup

We talked about the respiratory system as well and demonstrated the diaphragm and how it moves in relation to inhalation and exhalation.

Homework For Thursday

You have a quiz on Thursday so your homework is to study

Topics:

Homeostasis

Feedback Loops

Respiratory System

Homework for Tuesday Dec 4

Your homework for tomorrow is to read and answer the embedded prelab questions. Don't forget to read through the website I gave you last week for your quiz tomorrow.

1 mouse homeostasis lab from lvilleDrFox

Respiratory System

Circulatory and Respiratory systems

 

Today in class, we finished up feedback loops and discussed
Stimulus,
Response
Effector
Receptor
And Control Center
Can you identify each of the parts of a Feedback Loop?

We also started our discussion about the respiratory system. We watched the CrashCourse video and talked about the parts of the respiratory system. Why do we need to take in O2 and get rid of CO2? 

Parts: Mouth/Nose

          Larnyx
          Trachea
          Bronchus (Bronchi)
          Bronchiole
          Alveoli (where gas exchange occurs)


 Why Does Hank discuss the circulatory system with the respiratory system?

 

Homework for Monday

Your homework for Monday is to read the Breathing handout from HowStuffWorks and answer the questions.

Breathing reading from how stuff works from lvilleDrFox

Tomorrow we will be starting the respiratory system.

Body Temperature - Homeostasis

On Saturday we discussed homeostasis and examples feedback loops. 

Negative - thermoregulation (body temperature), Insulin production in the pancreas, 

Positive - Childbirth, blood clotting. 

We also discussed the parts of a feedback loop (see the video below)

Receptor
Effector

Stimulus

Response

You should also have read through the link below:

How does your body regulate temperature game

Below is the video that we watched in class. The second one is another description of body temperature regulation as a negative feedback loop