Slide 1
osmosissolventsolutiondiffusionLungs/alveoliLarge surface area/
volume ratioStomata/mesophyllActive transportsoluteI am a transport
process that involves the movement of gases and is passiveI am the
movement of molecules against their concentration gradientI am the
movement of water from a high concentration to a low
concentration.I am the word used to describe water when sugar has
dissolvedI am the word used to describe the sugarI am the
combination of both the water and the sugarI am the gas exchange
site in humansI am the gas exchange site in plantsI am a structural
adaptation that increases the rate of gas exchange
TITLE: Photosynthesis - making the linksObjectives:To know that
the lungs are the site of gas exchange in mammals (grade C)Villi
and microvilli allow efficient exchange in the small intestine
(grade C/B)Gas exchange is efficient due to structural adaptations
(Grade B/A)Gas exchange occurs by the process of diffusion (Grade
B/A)The diaphragm separates the thorax from the abdomenKEY
WORDS:
LungsAlveoli/alveolusBlood
vesselsCapillariesExchangeDiaphragmIntercostal
musclesInternalExternalSurface areaThin
layerMonocellularMoistureVilliMicrovilli
Outcomes:
Complete what am I starterMake observations of lung tissueLabel
a diagram of the lungs and an alveolusMake predictions of gas
composition in both inhaled and exhaled airComplete extended
writing activity for both alveolus and villi.
2
Make your observations of the lung tissue
Q:What is this diagram showing? What do you notice?To secure the
B grade - Whats the missing term? The lungs are the site of . The
alveoli has an excellent.. supplyThe cells of the alveoli are .
cell thickThe arrangement of the alveoli produces a large area to
volume .Gas exchangesurface ratiobloodoneIn summary - Adaptations
for exchanging materialHaving a large surface areaBeing thin
(monocellular) provides a short diffusion path (A grade)Animal have
an efficient blood supplyAnimals being ventilated is essential for
gas exchangeThe size and complexity of an organism increases the
difficulty of exchanging materials
Where is this structure found and what is its role?The small
intestine - villiThe villi provide a large surface area and provide
a network of capillaries to absorb the products of digestion by
diffusion and active transportThe villi consist of epithelial
cells. (unit 2)The villi are sites of nutrient absorption.
Nutrients are absorbed by the cells of the villi into the
capillaries within them. This absorption makes vitamins and
nutrients available to your blood and lymphatic fluid.
The cells of the villi produce enzymes which help digest
carbohydrates and protein. Most all of the absorption which occurs
in your body takes place in the small intestine through the action
of the villi. It is not difficult to see then how vital these body
structures are.Coeliac Disease and VilliCoeliac disease directly
impacts the role of the villi in digestion and absorption. This
autoimmune disease causes your body to damage the villi whenever
you eat foods containing gluten. If villi are damaged, their
ability to perform properly is impaired.The effects are two-fold.
First, damage or destruction of the villi decreases the amount of
surface area in your intestine available for absorption. Second,
rather than capturing valuable nutrients from your food, they are
excreted, increasing your risk of malnutrition as well as vitamin
and mineral deficiencies. This physical damage may be evident if
your doctor performs a biopsy of the small intestine in order to
confirm the diagnosis of coeliac disease.
Gluten is the protein found in wheat
Task: Complete the extended writing activity A grade
work.Describe and explain how both the alveolus and the villi
(microvilli) are adapted to be efficient exchange surfaces.
VentilationWhen we breathe in the intercostal muscles contact
and the diaphragm contacts. This increases the volume in the thorax
and decreases the pressure. Air rushes in.When we breathe out the
intercostal muscles relax and the diaphragm relaxes. This decreases
the volume and increases pressure. Forcing air out. This is called
VENTILATION.The lungs (T/F)The diaphragm is a large muscleThe lungs
are found in the abdomen When you breathe out the diaphragm
relaxes
When you inhale the intercostal muscles contractThe alveoli are
the site of exchange in the small intestine
TrueFalseTrueTrueFalse16