B2.2 Tissues and organs Flashcards
What is a tissue?
An aggregation of similar cells
What is an organ?
An aggregation of tissues PERFORMING SPECIFIC PHYSIOLOGICAL FUNCTIONS
Why do cells differentiate?
So that they can perform different functions
Name three types of tissue found in the stomach
- Muscular tissue
- Glandular tissue
- Epithelial tissue
What does the muscular tissue in the stomach do?
Churns the contents
What does the glandular tissue in the stomach do?
Produces digestive juices
What does the epithelial tissue in the stomach do?
Covers the inside and outside
“One organ may contain more than one different type of tissue.” True or False?
True
Define ‘organ system’
A group of organs that perform a particular function
Name 6 organs in the digestive system
- Salivary glands
- Pancreas
- Stomach
- Small intestine
- Large intestine
- Liver
What is the purpose of salivary glands and the pancreas?
To produce digestive juices (containing enzymes)
What happens in the stomach (and small intestine)?
DIGESTION; enzymes break large insoluble molecules down
What happens in the small intestine?
Soluble food molecules are absorbed into the blood
Why does the small intestine have a large surface area?
To increase the rate of diffusion from the gut to the blood
Name three plant organs
- Stem
- Leaves
- Roots
