Cells And Control Flashcards
What’s mitosis?
What’s it important for?
Process of cell division
Growth and repair
Stages of mitosis
Interphase - stage just before cells spend 90% of their time here. Replicate dna
Prophase- nucleus breaks down and spindle fibres appear
Metaphase- spindle fibres pull chromosomes to the middle of the cell
Anaphase - chromatids move to each end
Telophase- nucleus reforms
Cytokinesis- cytoplasm splits
What can we use percentile charts for ? What does 100th , 50 , 1st percentile mean
To measure growth
100- well above avaradhe
50- avaradhe
1 - well below avaradhe
What’s differentiation?
The process where unspecialised cells turn into specialised cells
How’s a nerve cell specialised?
Very long to carry impulses over long distances
What can an embryonic cell turn into?
Embryonic - can turn into any type of specialised cell in a human
What stem cells to plants have ?
Meristem
What’s a stem cell?
Unspecialised cells that can differentiate into specialised cells
What’s the Central nervous system made up of ?
Brain + spinal cord
What are the 3 types of neurons ?
Sensory neuron
Relay neuron
Motor neuron
Pathway of an impulse through the nervous system …
Stimulus
Receptors
Sensory neuron
Relay neuron
Motor neuron
Effector
Response
What’s the small gap between neurons called?
What happens in this gap
Synapses
Neurotransmitters are released
What’s the middle part of the brain called?
Back part?
Bottom?
Cerebrum
Cerebellum
Brain stem
What are the 2 type of scans to find out about the brain?
Ct scan
Pet scan
Whys the reflex arc quicker for reflexes?
Because there’s no brain involvement so it’s quicker
