Topic 1 Flashcards
Why is mitosis important?
Mitosis is important because its help repair and grow cells
What happens on the first stage of mitosis?
Interphase - the chromosomes are copied
What happens on the second stage of mitosis?
Prophase - spinal cord are formed in the cell and the nuclear membrane starts to disappear
What happens in the third stage of mitosis?
Metaphase - the chromosomes line up in the middle of the cell
What is the fourth stage of mitosis?
Anaphase - the chromosomes are pulled apart by spindles
What is the fifth stage of mitosis?
Telophase - the nuclei starts to reform
What is the sixth stage of mitosis?
Cytokinesis - Cells membrane divides the cell
How do tumours cancer occur?
When cells divide uncontrollably and don’t develop properly there fore causes cancer
Where are stems cells found in plants?
Stems cells are found in the meristem
Why are plant cells specialised?
So the can grow new leaves, roots throughout their whole life
What human cell can almost become any type of cell in the body and why?
Embryonic cell so the can become a full person
What are adult stem cells able to do?
Repair and replace damaged/ old cells
Give two diseases that could be potentially cured by stem cells?
Cancer and diabetes
Why is cells differentiation important in plants and animals?
Specialised cells to preform specific jobs
Where are the stem cells found
Differentiated tissue - human cells
Embryo - embryonic cells
What is the advantages and disadvantages of using stem cell medicine?
Advantages - cure diseases
Disadvantage - can be rejected from the body
How does the sensory neutron adapted to it’s function
The myelin sheath insulates the dendrons and the axon is longer so it speeds up the process.
What is are meristem cells found?
In the tips of roots and the shoots
Growth in plants
Mitosis
Elongation
Differentiation
Grows through out its life
Growth in humans
Mitosis
No elongation
Stages of reflex
Stimulus - change in environment heat, light, pressure
Receptors - sense organs sense the stimulus
Neutrons carry the electric impulses to the cns
Then goes back to the effectors that responded to the situation to protect your body from being damaged
What does the sensory neurones do?
Carries electric impulses from the receptors to the relay neurones
What does the relay neurones do?
Carry impulses from the cns to the motor neurones
What does the motor neurone do?
Carries the electric impulse to the effectors
