organisation and the digestive system Flashcards
Tissues
A group of similar cells that work together to carry out a particular function
organs
A group of different tissues to work together to preform a particular function
In the digestive system what does the glands do?
produce digestive juices
In the digestive system what does the stomach and small intestine do?
digest food
In the digestive system what does the livver do
produces bile
what does the small intestine do?
absorbs soluble food molecules
what does the large intestine do?
absorbs water from undigested food leaving feces
Why is increasing the temperature for enzymes to work faster not advisable?
- Can damage cells
- Takes a lot of energy
- speeds up non- useful reactions
What is an catalyst?
A substance that increases the rate of reaction without being changed or used up in the process
What is an enzyme?
a biological catalysts that are made by living organisms
- large protein
active site
complementary to the substrate
lock and key model
Substrate had to fit perfectly into the active site
Induced fit model
Enzyme changes shape slightly as it binds to the substrate
What can effect the functioning of enzymes
- temperature
- pH
Temperature affects to rate of reaction
- At the start as the temp increases so does the
rate of reaction as all the particles will have
more kinetic energy, so more likely to collide
and enough energy to react. - After 37 degrees, the rate starts to drop rapidly
due to the enzyme becoming denatured
