Zusammenfassung der Ressource
GCSE B2.1 Cells, tissues and organs
- 1.1 Animal and plant cells
- All living things are made from cells
- Most cells have some structures in common
- Plant cell
- Nucleus
- Cytoplasm
- Cell membrane
- mitochondria
- Ribosomes
- Animal cell
- Ribosomes
- Mitochondria
- Cell membrane
- Cytoplasm
- Nucleus
- Cell wall
- Chloroplasts
- Permanent vacuole
- Plant and animal cells are different because
they have different fuctions
- 1.2 Bacteria and yeast
- Bacteria
- Bacterial cells contain
- Cell membrain
- Cell wall
- Cytoplasm
- Plasmids
- Flagella
- No nucleus so
the genetic
material is
stored in the
cytoplasm
- When bacteria multiplies
it forms a colony
- Yeast
- Single-celled organism
- Yeast cells contain
- Nucleus
- Cytoplasm
- Membrane
- Cell wall
- 1.3 Specialised cells
- As an organism matures, each cells
develops to have their own fuction
- There are many different types of cell
- Root hair cell
- Sperm cell
- Look at the structures
of the cell for a clues
about its function
- 1.4 Diffusion
- Molecules in gases and liquids
move around randomly because of
the amount of energy they have
- Diffusion is the spreading out of
gas, or any substance in a solution
- Concentration gradient - the difference in
concentration between two areas is called the
- Because particles more randomly, there will
be a net movement from an area of high
concentration to an area of low concentration
- The larger the difference in concentration,
the faster the rate of diffusion
- 1.5 Tissues and organs
- Tissues
- A tissue is a group
of cells with a
similar structure
and function
- Animal tissues
- Muscle tissue - contracts to
bring about movement
- Glandular tissue - produces
substances like enzymes or hormones
- Epithelial tissue - Covers
some parts of the body
- Plant tissues
- Epidermal tissue - Covers the plant
- Mesophyll - can photosynthesise
- Xylem and phloem - transport
substances around the plant
- Organs
- Organs are made of tissue
- The stomach is an organ made of
muscular, glandular and epithelial tissues
- 1.6 Organ systems
- Groups of organs work together to
make an organ system
- One example is the digestive system
- The digestive system turns insoluble molecules into
soluble molecules so it can be absorbed into the blood